Our method is the sample used in this survey was 400 respondents and was obtained proportionally using sa tratified multistage random sampling method. The margin of error is +/- 4.9% and the confidence level is 95%.
Survey Quality Control:
GPS tracking. Intended to ensure that Surveyors do not carry out surveys that are not in accordance with the location, as well as to identify data collection (interviews) that are not concentrated at one point.
Watermark Verification. Carried out 100% of the incoming data, with the aim of identifying and proving the correctness of the field surveyor according to the assignment location.
Callbacks. From a total of 10 respondents in each PSU, 50% were contacted again to confirm and verify the correctness of the incoming data.
