autism kids vs healthy kids
to see what kind of differences between them.
how many autism kids is enough?
how to calculate the sample size?
thank you.
z*****n 发帖数: 444
2
you need to know the variance of this kind of samples in previous research
to get a good estimation.
You may need to check literature.
Here is a website:
try it. http://homepage.stat.uiowa.edu/~rlenth/Power/