Hi all, I have two datasets belonging to two periods of the presidential election. In the first round of the election, there were 5 candidates and close to 1000 polling stations. I have all votes for each candidate and the polling stations' registered voter numbers with absentees. The election went to the second round but only two candidates competed. Again I have same type of data as the first round. Now I would like to test whether in the second round turnover numbers for each polling station changed statistically or not. There are sure changes in voter turnout numbers but how statistically tested to say something about it?