eggnet
commented
12 years ago be careful Triet, the reason why you might want to use Chi-square over Fisher Exact are due to the computational costs of the Fisher Exact tests compared to the increased accuracy at approximating the result of the fisher exact test using chi square
After reading some article about Fisher Exact test , I think there are some controversy and limitation in when we want to use it. They say for a large sample (N>30) and each cell is more than 5, it is better to use Chi-squared test instead
Other article said when we should use Fisher Exact http://udel.edu/~mcdonald/statfishers.html
to be continue...