st: finding a mean with empty obs cells

From	"Jeff NASTERNAK" <[email protected]>
To	[email protected]
Subject	st: finding a mean with empty obs cells
Date	Tue, 06 Sep 2005 13:56:13 -0700

Hello
I have a data set that has up to 30 observations for one ID. All the IDs go up to 30 observations but most have between 10 to 15 observations. When I try to find the mean, how do I not take into account the empty cells for a particular ID?

thanks
Jeff

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