Survey ID Number
MUS_2009_ES_v01_M_WB
Title
Enterprise Survey 2009
Sampling Procedure
For Mauritius, the sectors included in the sample by two-digit ISIC code are as follows: Manufacturing: 15, 18; Other Manufacturing: 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 , 36, 37; Services: 52; Residual/Remainder/Other Services: 45, 50, 51, 55, 60, 61, 62, 63, 64, 72. The Enterprise Survey for Mauritius targeted 480 registered establishments with at least five employees, 120 registered establishments with one to four employees (micro), and 120 non-registered firms in the sectors defined above. The sampling for registered and non-registered establishments was implemented separately.
In the Enterprise Surveys, the requirements for registration are defined on a country-by-country basis using the information collected by Doing Business and information from the in-countrycontractors. In Mauritius, the registration requirement used to differentiate the sample was registration with the Register of Companies.
The sample for registered establishments in Mauritius was selected using stratified random sampling. Two levels of stratification were used in the Mauritius sample: firm sector and firm size.
Industry stratification was designed as follows: the universe was stratified into three manufacturing industries (food, textiles, and other), one services industry (retail) and one residual sector. The initial sample design had a target of 240 interviews in manufacturing and 120 interviews each in the services and residual categories, though this sample design was later adjusted to reflect the low prevalence of manufacturing establishments in Mauritius. The initial sample design for micro targeted 120 establishments, 60 in manufacturing and 60 in services. The sample design for the informal survey was designed to mirror the micro sample.
Size stratification was defined following the standardized definition used for the Enterprise Surveys: micro (1 to 4 employees), small (5 to 19 employees), medium (20 to 99 employees), and large (more than 99 employees). For stratification purposes, the number of employees was defined on the basis of reported permanent full-time workers.
Given the stratified design, sample frames containing a complete and updated list of establishments as well as information on all stratification variables (number of employees, industry, and region) are required to draw the sample for the Enterprise Surveys. Two frames were used for the Mauritius Enterprise Survey. The first was a file of registered companies provided by the Central Statistical Office [CSO] in Mauritius updated to 2008. The second frame was supplied by the World Bank. It consisted of enterprises interviewed for Enterprise Survey (ES) in 2005. The World Bank required that attempts should be made to re-interview establishments responding to the 2005 survey where they were in the selected geographical regions and met eligibility criteria. That sample is referred to as the Panel.
The quality of the frame was assessed at the onset of the project and was not immune from the typical problems found in establishment surveys: positive rates of non-eligibility, repetition, non-existent units, etc. Given the impact that non-eligible units included in the sample universe may have on the results, adjustments may be needed when computing the appropriate weights for individual observations. The percentage of confirmed non-eligible units as a proportion of the total number of sampled establishments contacted for the survey was 35.2% (1039 out of 2,950 establishments for the ES and micro samples, including panel establishments).