It occurred to me that many of the questions which I receive which are ``quick questions" at the University are beginning to repeat themselves. For this reason, I'm going to add a few often-repeated web pages which I've found quite useful.

Some Common Questions

(to be added to as I continue responding during the semester)

1. How many people should I have in my study? (``When I'm doing a t-test, testing a correlation, multiple regression, logistic regression, complex analysis of variance etc..."

There are basically two ways to approach this. First, on the Web, it's a good idea to check out the power calculators located at UCLA.

For those times when you need to do more complicated analyses, take a look at the UnifyPow home page to learn about a wonderful SAS macro which will handle many, many possibilities.