The CPS survey is a follow up survey designed to provide information that will help to evaluate the current situation and status of the police services which had been delivered to the public since 2010 which was conducted by NUS Consult Ltd. It aims to provide an enabling environment to facilitate quality policing services, and, for policing services to deliver the most effective and efficient services pertaining to public safety, crime, and, general policing within Samoa.
The CPS 2013 is a nationally representative sample survey designed to collect data that would help to evaluate policing programs over the previous three years (2011-2013), and, to provide feedback and views from the community or public on the delivery of policing services to all.
Kind of Data
Sample survey data [ssd]
Version 1 - This file is edited dataset, clean, anonymized, available for public use.
National coverage Region
Unit of Analysis
Individuals 18 years of age and over were the units of analysis.
The target population was adults 18 years and older residing in the community.
Producers and sponsors
Authoring entity/Primary investigators
Samoa Bureau of Statistics
Ministry of Police and Prison
Australian Agency for International Development
Government of Samoa
In national statistical surveys, the region of Apia Urban Area (AUA) represented the urban population while the regions of North West Upolu (NWU), Rest of Upolu (ROU) and Savaii represented the rural population.
The target population was adults 18 years and older residing in the community. Hence all persons 18+ who were usual residents of the household were eligible in the survey. The sample for the CPS 2013 was drawn from the master sample frame of the List of occupied households compiled in the most recent Population and Housing Census 2011. The sample size was based on a 95 percent confidence interval of ± 5 percent margin of error; assuming an 80 percent response rate; a design-effect of 1.5 to allow for clustering of the complex design; and; an average of 3 persons 18+ per household. The design also considered the features of a follow-up survey assuming that the policing services had improved by at least 10 percent since the baseline CPS 2010 results. After taking into account all those features, it resulted in the required sample size of 540 persons aged 18 years and older.
Therefore in order to achieve the sample size, a representative probability sample of households was selected in two stages The first stage involved the selection of clusters from the master sample frame using stratified systematic sampling with probability proportional to size. A total of 45 primary sampling units or clusters were selected in which 10 clusters were selected from the urban areas and 35 clusters were selected from the rural areas. The design did not allow for replacement of clusters or households.
In the second stage, a total of 5 households were selected from each cluster using systematic equal probability selection for inclusion in the survey. Normally an updated household listing from selected clusters could have been done to select 5 households. However, due to the unexpected request of the MPP survey in February 2013, and the fact that the census 2011 was just completed in the previous two years, it was seen not necessary to conduct a fresh household listing which would have taken SBS another two months to carry out causing delay to the survey.
A total of 225 households were selected for the sample of which 216 were found occupied at the time of the survey. Of the occupied households, only 209 were successfully interviewed resulting in a household response rate of 96.8 percent. The other households were not available throughout the survey period despite repeated visits by the field teams.
The total eligible persons 18 years and older who were found in the interviewed households were 731. Out of this total, only 645 were successfully interviewed yielding the Individual response rate of 88.2 percent.
The response rates by sex shows 90 percent for females and 87 percent for males which is not surprising as males usually spent more time away from home than females. That situation was reflected more in the regions of North West Upolu and Rest of Upolu than in Savaii and Apia Urban Area. The high response rate in Savaii was due mainly to the field teams sleeping over in Savaii for one week. Therefore, the Savaii team had extra time after hours to make call-backs while the team in Upolu had to commute daily until 7pm for repeated visits, hence missed out on those who come home later.
Given the complex sampling design used to control survey costs, sampling weights are routinely used in probability sampling to compensate for unequal probabilities of selection and adjustments for non-coverage of the population and non-response. The weights will ensure that the sample is representative of the national and regional population. The sampling weight for each household is the inverse of its overall selection probability with correction for non-response and the individual weight is the household weight with correction for individual non-response. Once those complex design features are compensated for, then weights can be used in the estimation of the population characteristics of interests and the sampling errors of the survey estimates. Unweighted numbers will be used to report response rates but all other survey estimates and precision will be based on weighted numbers.
Dates of Data Collection (YYYY/MM/DD)
Mode of data collection
The actual fieldwork started in April 18th to May 3rd. The call backs or repeated visits were made afterwards for another three weeks from May 6-24. The coding of closed-ended questions was done during the interviews but the coding for the open-questions in each section of the questionnaire was a bigger challenge which took two weeks for the full-time staffs to summarize into major issues. After coding, the computer data program was created using CSPro 5 software for data entry. After testing the program, the data entry was conducted in one week (May 27-31).
The role of the supervisor was to coordinate field data collection activities, including management of the field teams, supplies and equipment, finances, maps and listings, coordinate with local authorities concerning the survey plan and make arrangements for accommodation and travel. Additionally, the field supervisor assigned the work to the interviewers, spot checked work, maintained field control documents, and sent completed questionnaires and progress reports to the central office.
Type of Research Instrument
Based on the request by MPP, a structured English questionnaire which was used in the CPS 2010 was also implemented in the CPS 2013. However, SBS made some improvements in terms of instructions between questionnaire sections in order to make the interviewing flow properly from beginning to end. The questionnaire was also translated into the Samoan language to complement the English questionnaire so that the interpretation of questions by the field enumerators was consistent on the field. In addition, since probability sampling and complex design was used, a new cover page of the questionnaire was developed so that selected clusters and household identification were clearly made and that features to account for non-coverage of the households and non-response of eligible persons 18 years and older were also accounted for during the fieldwork.
The questionnaire therefore has five parts. Section A has 5 questions about the respondent details. Section B contains 7 questions intended to find out the community's views on safety and crime plus an open question for the respondents to express their own opinions about the topic. Section C contains 7 questions to find out the respondents personal awareness and experience (if any) of crime and crime management. An open question was also added for their own opinions. Section D contains 4 sub-sections (D1 to D4) which seek questions on the overall community perception of the MPP services whereby each sub-section also contained open-questions. D1 contains 3 questions about the assistance sought by the community at the MPP. D2 contains 2 questions about the control of crime. D3 contains 4 questions about police service in general and D4 contains 2 questions about the access to police information, education and communication. Section E is the last section which was again open to the respondents to make their own suggestions on how police can improve their job to assist the community.
Samoa Bureau of Statistics
The data editing, cleaning and weighting of the data took another two weeks (June 4-14) to complete, leaving only two weeks (June 17-30) to analyse and write the analysis report to meet the deadline.
Confidentiality of respondents is guaranteed by the Statistics Act 1971. Before being granted access to the dataset, all users have to formally agree:
1. To make no copies of any files or portions of files to which she/he is granted access except those authorized by the data depositor.
2. Not to use any technique in an attempt to learn the identity of any person or establishment not identified on public use data files.
3. To hold in strictest confidence the identification of any establishment or individual that may be inadvertently revealed in any documents or discussion, or analysis. Such inadvertent identification revealed in her/his analysis will be immediately brought to the attention of the data depositor. This statement does not replace a more comprehensive data agreement (see Access condition).
The Samoa Community Perception Survey microdata is available for distribution as licensed-use files. Please contact the identified contact persons to request for the dataset.
Conditions for use of licensed datasets are:
1. The data and other materials provided by the Samoa Bureau of Statistics (SBS) will not be redistributed or sold to other individuals, institutions, or organizations without the written agreement of the SBS.
2. The data will be used for statistical and scientific research purposes only. They will be used solely for reporting of aggregated information or the development of statistical models, and not for investigation of specific individuals or organizations.
3. No attempt will be made to re-identify respondents, and no use will be made of the identity of any person or establishment discovered inadvertently. Any such discovery would immediately be reported to the SBS.
4. No attempt, without prior approval, will be made to produce links among datasets provided by the SBS, or among data from the SBS and other datasets that could identify individuals or organizations, nor for destroying the business operations of individuals or organizations.
5. Any books, articles, conference papers, theses, dissertations, reports, or other publications that employ data obtained from the SBS will cite the source of data in accordance with the Citation Requirement provided with the dataset.
6. An electronic copy of all reports and publications based on the requested data will be sent to the SBS.
7. The original collector of the data, the SBS, and the relevant funding agencies bear no responsibility for use of the data or for interpretations or inferences based upon such uses.
8. The primary and other researchers who will be involved in using the data must be identified.
9. The researchers' organization must be identified as must a suitable representative of the organization who must be a signatory to the license.
10. The intended use of the data including a list of expected outputs and the organization's dissemination policy must be identified.
11. A formal agreement must be signed that the files will not be shared beyond the boundaries of the organization. In the case of a blanket agreement where it is agreed that the data can be used broadly within the receiving organization in a secure manner, the receiving organization must demonstrate a capacity to manage the data files in a secure manner (with an identified individual assigned formal responsibility for doing so) and each additional new user be made aware of the terms and conditions that apply to the data files. This must be achieved by having the users sign an affidavit. Where a blanket agreement exists and data security procedures are in place, it will not be necessary for the users to destroy the data after use is complete.
Disclaimer and copyrights
This report summarizes the findings of the Samoa Community Perception Survey 2013 carried out by the Sasmoa Bureau of Statistics. Funding for th SCPS was received from the Australian Agency for International Development (AusAID) in collaboration with the Ministry of Police and Prison ISP Samoa.
Samoa Burau of Statistics(SBS) and Ministry of Police and Prison(MoPP) 2013.
Samoa Bureau of Statistics
Junior Ah Yen
Samoa Bureau of Statistics
Documentation of Samoa Police Community Perception Survey 2013
Date of Production
Version 01 (April2014)- this is the first documentation of the SPCPS 2013