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2.955294
2006 Jun 12
3
Group averages
Hello:
I hope none of you will mind helping a newbie. I'm a student research
assistant working with a large data set in which observations are
categorized according to two factors. I'm trying to calculate the group
mean and variance of a variable (called 'hsgpa' in the example data
presented below) to each observation , excluding that observation. For
example, if there are