I am working for a humanitarian organisation in an internally displaced persons camp in South Sudan. The camp has about 100,000 people. We know that there have been a few different campaigns in recent months to improve the vaccination coverage for polio and measles. However, the campaign data appears to be a bit unreliable compared to the population data that we have. Therefore, we would like to implement a vaccination coverage survey to estimate the proportion of children between 6 months and 5 years that are currently immunised for polio and measles. We calculated a sample size of approximately 400 children that we need to include in the survey to estimate the coverage. We are now wondering what sampling techniques we should use to implement this survey. Do you have any advice?
Thank you for your suggestions