Survey ID Number
IDN_2015_ES_v01_M
Title
Enterprise Survey 2015
Sampling Procedure
The sample was selected using stratified random sampling. Three levels of stratification were used in this country: industry, establishment size, and region.
Industry stratification was designed in the way that follows: the universe was stratified into seven manufacturing industries and two services industries- Food and Beverages (ISIC Rev. 3.1 code 15), Garments (ISIC code 18), Textiles (ISIC code 17), Chemicals (ISIC code 24), Rubber and Plastics (ISIC code 25), Non-metallic mineral products (ISIC code 26), Other Manufacturing (ISIC codes 16, 19-23, 27-37), Retail (ISIC code 52) and Other Services (ISIC codes 45, 50, 51, 55, 60-64, and 72).
Size stratification was defined following the standardized definition for the rollout: 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. This seems to be an appropriate definition of the labor force since seasonal/casual/part-time employment is not common practice, apart from the construction and agriculture sectors which are not included in the survey.
Regional stratification for the Indonesia ES was done across nine regions: Jawa Barat, Jawa Timur, Jawa Tengah, DKI Jakarta, Banten, Sulawesi Selatan, Sumatera Utara, Bali and Lampung.
The sample frame consisted of listings of firms from four sources: First, for panel firms the list of 1,444 firms from the Indonesia 2009 ES was used. Second, for fresh firms (i.e., firms not covered in 2009), economic census data from Statistics Indonesia known in Indonesia as Badan Pusat Statistik, henceforth BPS, was used. 2006 BPS data was used for service firms and small manufacturing firms and 2012 BPS data was used for medium and large manufacturing firms.
Data for service firms were updated by cross-checking with lists from several business associations namely Aprindo 2013 for retail, AKI 2013, AKSINDO 2012 and Gapenri 2014 for construction, PHRI 2012 for hotels and restaurants and ALFI/ILFA 2014 for transportation.
The quality of the frame was enhanced by the verification process conducted by the contractor Kadence International. However, the sample frame 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 4.1% (108 out of 2,629 establishments).