search for: 4.140025

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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