SPC_KIR_2006_HIES_v01_M_v01_A_PUF
Household Income and Expenditure Survey 2006
Name | Country code |
---|---|
Kiribati | KIR |
Income/Expenditure/Household Survey [hh/ies]
The Kiribati Household Income and Expenditure Survey (HIES) 2006 is the second HIES after the first survey in 1996. It was funded by Asian Development Bank (ADB) and Techincal Assistance provided by the Pacific Community (SPC).The survey included modules on personal and household income, household expenditure and diary information.
The purpose of the Household Income and Expenditure Survey (HIES) survey is to obtain information on the income, consumption pattern, incidence of poverty, and saving propensities for different groups of people in Kiribati. This information will be used to guide policy makers in framing socio-economic developmental policies and in initiating financial measures for improving economic conditions of the people.
Some more specific outputs from the survey are listed below:
a) To obtain expenditure weights and other useful data for the revision of the consumer price index;
b) To supplement the data available for use in compiling official estimates of household accounts in the systems of national accounts;
c) To supply basic data needed for policy making in connection with social and economic planning;
d) To provide data for assessing the impact on household living conditions of existing or proposed economic and social measures, particularly changes in the structure of household expenditures and in household consumption;
e) To gather information on poverty lines and incidence of poverty throughout Kiribati.
Sample survey data [ssd]
Persons, Households, Expenditure items.
Version 01: Cleaned, labelled and anonymized version of the Master file.
2008-12-02
Reconstructed dataset from an Access dataset.
-PERSONS: income and employment of individuals, including wage and salaries, self-employment, business activities, education, health.
-HOUSEHOLDS: dwelling characteristics, housing expenditure, household operations, clothing and footwear, education and health expenditure, and food expenditure.
-EXPENDITURE ITEMS: total annual expenditure on commodity and utility items, type of expenditure and type of item.
National Coverage and Regional Island Groups (Northern Gilberts, South Tarawa, Central Giberts, Southern Gilberts, Linix).
There are five main populations of interest for which estimates are required for the 2006 Kiribati HIES: South Tarawa, Northern, Central and Southern Gilbert Islands, and the Line Islands.
The survey covered all persons resident in private households during the month of October 2006. It excluded persons living in institutions such as dormitories, hospitals, prisons or other institutions. Also excluded from the survey were ex-patriot temporary residents and permanent residents who were not residing (and intending to reside) in Kiribati for at least 12 months.
Income data were collected from persons aged 15 years and over and expenditure data from obtained from all household members at a household level.
Name | Affiliation |
---|---|
Kiribati National Statistical Office | Government of Kiribati |
Name | Role |
---|---|
Pacific Community | Technical assistance |
Name | Role |
---|---|
Kiribati Ministry Of Finance | Staffing costs |
Asian Development Bank | Survey Costs |
Documentation for Kiribati HIES Sample Selection:
SAMPLE SIZE:
In determining an appropriate sample size for a survey of this nature, numerous factors come into the equation. These include:
a) The degree of accuracy required for key estimates
b) The population size of the country
c) The manner in which the sample is selected
d) Cost or staffing constraints which may exist
e) Whether or not estimates are required for sub-populations
f) The level of variability in the data being collected
Each of these factors have different magnitudes of importance, but the major priority should always be on selecting a sample big enough to produce results of suitable accuracy. Many of these issues are generally known as well - for instance:
· A user group may pre-specify what level of accuracy they may wish to achieve for the survey
· The population of a country can normally be estimated to a reasonable level of accuracy
· The sample selection technique adopted is known
· Cost and staff constraints are generally known, and
· A user group can once again provide information on whether estimates for sub-populations are required.
The one thing that normally isn't known is the degree of variability in the data being collected - this information comes after the survey. This factor is important because if there is not much variability in the data for key estimates, then the sample size does not need to be as large, and vice versa.
Without this sort of information, determining the appropriate sample size for a survey can often involve a bit of guess work. For that reason, based on previous survey experience in other Pacific Island countries, a sample of 10 per cent was considered more than sufficient for Kiribati. An additional 10 per cent of sample was selected to allow for sample loss.
As a result, a sample size of 1,555 households (10 per cent of 13,999, with a 10 per cent top-up) was considered suitable for the survey.
Allocation to "Target Areas"
For the Kiribati HIES, five target areas were identified as sub-populations for which estimates would be desirable. These five areas were:
Once the sample size of 1,555 had been determined, the next step was determining how the sample should be allocated to each of these target areas in order to produce the required level of accuracy for each area. In order to achieve this, the sample was allocated in such a manner that the expected level of accuracy for each stratum would be similar. The resulting sample allocation can be found in the table below.
STRATIFICATION:
To achieve better representation within each target group, each target group was further stratified by grouping "like" islands. The plan from there was to select an island from each stratum to represent it. As a result, 11 strata were formed, with each of the 23 populated island/atolls of Kiribati allocated to one of these strata. The resulting strata, and islands which make them up, can be found in the following table.
The allocation of the sample to stratum within each target group was achieved by simply allocating the sample proportional to the population for that stratum. For example, for the target group Northern Gilbert, an overall sample size of 323 was desirable. To determine how much of that sample would be allocated to the first stratum which consisted of Makin and Butaritari, the following formula was applied:
n (Makin & Butaritari) = 323 * (889)/(889+1290+867)
= 94
EXCLUDED AREAS:
Although it would be desirable to cover all of Kiribati for this survey, due to cost and time constraints a couple of areas were excluded from the frame before the selections were made. The two areas removed from scope were:
· Banaba
· Kanton
The impact on final estimates is considered to be very small given the small populations on these two islands; 61 households on Banaba, and 9 households on Kanton. This accounts for about 0.5 per cent of the population of Kiribati.
SAMPLE SELECTION TECHNIQUE:
Selection of Islands:
For the stratum with more than one island, an island had to be selected in order to represent that stratum. The process used for this stage of selection was probability proportional to size (pps) sampling, where the size measure was the number of households on the island.
An example of how this process worked can be found below for the Central Gilbert - Group 2. For this stratum, a random number was selected between 0 and 1,005. Given the random number (254), fell within the cumulative number of households for Abemama, then that island was selected.
Selection of Households:
To minimize the travel requirements of interviewers, and thus travel costs, a two stage process was adopted to selected households.
The first stage of the process involved selecting EAs using probability proportional to size (pps) sampling. The required number of EAs to select from each island was simply determined by dividing the number of households to sample on that island by roughly 15, where 15 was the cluster size chosen from each selected EA.
Having selected the EAs in sample, a systematic skip was run through the list of households for each EA to determine which households would be selected in sample. These selections were performed in the NSO, and the lists provided to interviewers in the field. The lists used for this stage of selection were based on the 2005 Population Census, and thus would be out-of-date by a year or so, but given the significant gains in simplifying field logistics, this was the preferred option.
The response rate was 85.6% of the total number of households 1,555.
Sample weights were calculated for each stratum and adjusted for non-response. Weights for the survey were derived using the inverse of the households probability of selection.
Four questionnaire forms were designed to collect information on household size and composition, personal and household income, major household expenditure, and regular food and household supply expenditures in the diaries. The income and expenditure questionnaires were administered by interview during the survey period, and the diaries were completed by the households over a two-week period. An additional questionnaire was developed and administered to collect detailed information on health facility utilization and access, educational attendance and attainment, and labour force status.
The questionnaires were published in English.
-HOUSEHOLD CONTROL FORM:
The Household Control Form (HCF) should be filled in during the first visit to the household. Its main objective is to collect basic demographic information about members of the household. Before completing this form however, the interviewer needs to determine if the household is in scope for the survey.
Only those households which have been residing in Kiribati for more than 1 year, or those households who intend to reside in Kiribati for a total of 12 months or more, should complete this form and partake in the survey. These households can be identified by going through section (e) in the field book for interviewers. If the household does not meet these criteria, then the survey is over. In assessing the eligibility of a household to be in the survey, use some common sense - there will be many occasions when it will be clear that the household has always lived in Kiribati, so don't bother asking these questions.
Once this issue has been addressed, the HCF can be filled in for the household. The HCF form is to record names of all the usual members of the household. Information on relationship to head of household, sex, date of birth and ethnicity are asked of all members in the household. For persons aged 15 and over, questions on marital status, educational attainment, activity status, literacy status and internet usage are also asked. Codes should be used to complete these questions, and they can be found in the interviewer's field book in section (a). You must enter the code for these questions.
-EXPENDITURE QUESTIONNAIRE:
The purpose of this questionnaire is to record household expenditure that is not included in the diary. There are some big purchases that the household may only make once or twice a year. Also the household may make regular payments, which may not be done during the survey period, and we would need to know such payments to produce good and complete estimates.
There are 15 sections in the Expenditure Questionnaire which relate to the following:
Detailed instructions for each section are not provided here as they can be found in the questionnaire itself on the left hand side of the booklet.
-INCOME QUESTIONNAIRE:
This questionnaire is to record the household's total income received or earned in the last 12 months. Information will be collected for all usual members of the household who are 15 years and over. Visitors are not to include their income earned in this section.
There are 7 sections in the Income Questionnaire which relate to the following:
Detailed instructions for each section are not provided here as they can be found in the questionnaire itself on the left hand side of the booklet.
-WEEKLY DIARY:
For each household observed, there will be two books, one for the first week and one for the second week. This is to keep a record of all daily expenditure for the 14 days. Interviewers have to make sure that these diaries are being kept for each day. Instructions on how to use the diary have been written on the front pages of these diaries.
In normal circumstances, the head of household organises the household activity. In some households this may not be the case - some members of that particular household may not be seeking the authority of the head when some expenditure is encountered. This situation may result in not recording all expenditure in the diary. The interviewer should discuss the matter with the head of the household to ensure that each member's expenditure is recorded in the household diary. If a member of the household does not co-operate with the head of the household he/she may be allocated a separate diary. That member of the household should be explained the full responsibility of recording the diary.
There are 4 main sections making up each weekly diary:
Start | End |
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2006-10-02 | 2006-11-14 |
Name | Affiliation |
---|---|
Kiribati National Statistics Office | Government of Kiribati |
Responsibilities and Functions of the Supervisor
To supervise in accordance with the directions of the Statistics Office staff, the completion of the HIES 2006 for all selections, specifically to:
a) With assistance from the Island Council, undertake the recruitment of interviewers on their respective islands;
b) Ensure that all schedules and materials are distributed to interviewers according to the instructions of the NSO staff;
c) Ensure that the interviewers understand which household he/she is responsible for and that none are left out;
d) With assistance from the interviewer, conduct information sessions for selected households prior to collecting information from those households;
e) Visit interviewers regularly during the collection phase to make sure they are carrying out their responsibilities correctly;
f) Make sure all forms from the interviewers are accounted for at the end of each 3 week period;
g) Do spot checks for completeness of questionnaires and deal with any problems that might arise in the field;
h) Dispatch all completed questionnaires (in sealed envelopes) to the NSO after he/she is fully satisfied that
(i) All the entries of the questionnaires are properly completed.
The National Statistics Office recruited and trained 12 supervisors. The completed survey forms were processed by staff of the National Statistics Office who recorded their receipt from the supervisors and checked the questionnaires for completeness.
-FIELD WORK:
The survey was conducted over a 6 week period beginning on 2 October and finishing on 14 November 2006. The National Statistics Office recruited and trained 12 supervisors and x interviewers to conduct the survey in the 11 selected islands. Over the survey period each interviewer completed two workloads (around 30 households). The lack of air transportation to the outer islands during the survey period delayed the planned start date of the enumeration and also hindered the return of survey forms to the statistics office for processing.
The field activities are the most important stage of the survey. The identification of the households and the arrangement of the visiting periods are important to ensure that the objectives of the survey are met and that errors which occur in the field, can be corrected and handled without further cost. Each household will be observed for a period of 2 weeks and questions will be asked of their expenditure and income for the last 12 months.
Interviewing households on Sundays are discouraged and also Saturdays if the household members are Seventh Day Adventists.
A calendar of activity has been included in the two field books.
-IDENTIFYING SELECTED HOUSEHOLDS:
The first task an interviewer needs to undertake for each workload is to familiarise themselves with the households selected in the workload. Quite often the interviewer will know the household in advance, before even visiting the location, so these households will be straight forward. For the remaining households, of which there will be few, the interviewer may be required to ask assistance from people in the area to help assist finding the right household.
It is very important to go to the households that have been selected in the survey for you to enumerate, and thus not change any of these selections. If you are having trouble locating any household, you can always call on the assistance of both your supervisor and the NSO. This should be done as early as possible in the process to give time to the supervisor/NSO to provide the required assistance.
-THE 3-WEEK CYCLE:
Each interviewer will be responsible for interviewing 24 - 32 households during the 6 week period. This will comprise of 2 workloads of 12 - 16 households each. Addressing each workload will take about 3 weeks in total. The procedure an interviewer should follow during this 3 week period is as follows:
Week 1: Travel around the selected area and identify the location of the households for that workload. Invite the selected households to an information session (providing refreshments), and provide information about what the survey is aiming to achieve. Make sure all households have their first 1-week diary and conduct the Household Control Form for each household if time permits.
Week 2-3: Visit every selected household each day if possible and assist with filling out the diary. Conduct the expenditure and income questionnaires for each selected household at any stage throughout the 2 week period - the earlier the better.
The day after the 3rd week, the interviewer should make sure all information is accounted for and returned to the supervisor.
This 3 week cycle should occur 2 times over the 6 week period.
-THE INFORMATION SESSIONS:
The information sessions for each household are an extremely important part of the survey fieldwork. It will be during these sessions that households will be explained the importance of the survey, and encouraged to participate fully in the survey. If these information sessions don't work effectively, they could have major implications on the response rates for the survey, and hence the final results.
It will be the responsibility of the interviewer to visit each selected household in the first day or two of week 1, and advise them about the information session - when it will be held, and where. The household head should be encouraged to attend the session, but if they are not available, another responsible adult can take their place. The interviewer, with assistance from the supervisor, will be responsible for identifying suitable venues, and providing refreshments.
Every effort must be made to explain the importance of the survey to the households during these sessions. The sort of basic information which should be provided includes:
· What the survey objectives are
· The strict confidentiality aspects of the survey
· The importance of each household's co-operation to the success of the survey
Time should also be allocated to answer any questions the households may have about the survey.
During these sessions, the first 1-week diary can be handed out to the households. If for some reason, a member of a selected household can not attend the session then the interviewer must make sure they visit that household before the start of the second week and drop off the first week diary.
-VISITS DURING WEEKS 2 and 3:
During the middle 2 weeks of the 3 week cycle, households are required to fill in the two 1-week diaries they are provided with. It is also during this period that each of the main questionnaires needs to be filled in:
i) Expenditure questionnaire
ii) Income questionnaire
These are quite long questionnaires, so don't leave this work until the end of this two week period, as it won't get completed on time. Also during the two week period, the interviewer must visit each selected household as many times as possible to check on the progress of the diary.
-THE FINAL VSISIT:
The day after the 3rd week is finished, the interviewer must make their final visit to the household to collect the last diary and any other survey material still with the household. It is during this visit that the interviewer must ensure that all survey material for that household has been completed correctly. This includes:
i) Household Control Form
ii) Expenditure Questionnaire
iii) Income Questionnaire
iv) Diary (x 2)
v) Envelope covers (back and front)
It will be more difficult to go back and visit households after the fieldwork is complete, so it is very important that checking of final materials is done either before or during this final visit to resolve any problems.
The completed survey forms were processed by staff of the National Statistics Office who recorded their receipt from the supervisors and checked the questionnaires for completeness. The status of incomplete questionnaires was recorded as either out of scope, vacant dwelling, unable to be contacted, and refused to respond.
The completed questionnaires were entered into a data entry system (CSpro) and after editing and imputation, the data was loaded into a database (MSAccess) and tabulated using Excel pivot tables.
There are five types of checks performed: Structural check, Verification check, Consistency check, Macro Editing check, Data Quality assessment
Edit lists have been produced for health module, income and expenditure questionnaire which need to been checked against the questionnaires.
On the edit list correct the error by crossing out the incorrect or missing value and enter the correct value in red.
Missing amounts that are also missing on the questionnaire will need to be estimated using estimates from questionnaires in the same EA batch.
For the diaries, concatenate the batch files for each province and export to tab delimited files. Import into Excel and calculate unit price for each item using quantities and weights where possible.
Filter records for each item code and check for outlier unit price values (both large and small values as well as missing values). Missing amounts will need to be estimated using average prices from the items within the same EA.
The quality of data obtained through a household survey is subject to both sampling and nonsampling error. Both types of error can be assessed using statistical measures and the level of error reported in a data quality evaluation.
It should be noted that the analysis of the data contained in this report is based on a sample of households and therefore the estimates produced are subject to sampling error. It is anticipated that the relative standard error for the key estimates of total household income and expenditure will be less than five percent, which is the level at which the estimates are considered to reliable.
Standard errors for the key estimates will be calculated and included in the final report (provided as External Resource). A total of 1161 households out of 1546 selected fully responded to the survey, representing an overall response rate of 75 percent. Of the non-responding households, 8.2% refused to respond to questions, 5.3% were not able to be contacted, 9.1% were vacant dwellings, and 2.3% were out of scope for the survey. Lower responses rates (less than 70%) were obtained from Nonouti, North and South Tarawa than in the other surveyed islands. However, the response rate for each island group (apart from South Tarawa) was above the total response rate of 75%, indicating a very good level of response. Table 1.2 shows the number and percentage of responding households by island.
A data audit was completed - refer to the "Final Report - Kiribati 2006 HIES" in the External Resources.
Name | Affiliation | URL | |
---|---|---|---|
Kiribati National Statistics Office | KNSO | www.spc.int/prism | director@nso.gov.ki |
Is signing of a confidentiality declaration required? | Confidentiality declaration text |
---|---|
yes | The HIES data is protected under the National Statistics Act and cannot be disclosed to any individual without authorisation from the Government Statistician. |
Licensed datasets, accessible under conditions.
"Kiribati National Statistics Office, Household Income and Expenditure Survey 2006 (HIES 2006), Version 01 of the licensed dataset (December 2008), provided by the Microdata Library. https://microdata.pacificdata.org/index.php/home"
All publications need to be cleared by National Statistics Office (NSO) before publication as under the Statistics Act the NSO only has authority to publish national statistical data.
c 2006 Kiribati National Statistics Office
Name | Affiliation | URL | |
---|---|---|---|
Government Statistician | Kiribati National Statistics Office | stats@nso.gov.ki | www.spc.int/prism |
DDI_SPC_KIR_2006_HIES_v01_M_v01_A_PUF
Name | Affiliation | Role |
---|---|---|
Statistics for Development Division | Pacific Community | Documentation of the study |
2008-12-02
Version 01 (December 2008): First attempt at documenting the Kiribati Household Income and Expenditure Survey of 2006.
Version 02 (July 2019): Review of existing documentation aiming at providing and documenting the datasets. Done by Statistics for Development Division in New Caledonia.