Chuck is a broken record
From Peace Corps Wiki
I'm all for open government and such. The issue with country level survey data, however, is confidentiality. In some countries, the numbers are low enough that looking at the data can give you a pretty good idea on how people responded at an individual level. That's not cool. But country summary level stuff should be out.
Ranking posts just by this survey is not totally fair. This is one perspective - the volunteer respondent. There is a lot that can skew that and just "ranking" posts is not the way to go. There are other issues that go into all of these results and what a good posts is about than just volunteer opinion at one point in time.
Understand the on-boarding process: you apply, if you pass initial screening you get nominated. Once nominated, you go through legal/background check, medical clearance, and more assessment. If you get all through that, you get invited. So not fair to compare # that clear medical to the # invited. Only about 1/3 of applicants ever get to serve.
ET rates are at the lowest levels of the history of Peace Corps. In the late 60s, it was close to 60%. You are never going to get people to stop leaving early. Most that resign leave within the first 3 months. Better for them to go. Some leave around a year. That should be an issue of trying to make sure people have proper incentives to stay at this point. Another bunch leave around 20 to 24 months, because they have accomplished much of what they will and have other things (school, jobs) come up. The majority of people that resign do so for personal/family reason.