[R] Grouped data

From: David Scott <d.scott_at_auckland.ac.nz>
Date: Mon, 28 Apr 2008 12:45:06 +1200 (NZST)

I have been given some data in summary form, as means and standard deviations for a number of studies. I want to combine some studies to obtain overall means and standard deviations and also to carry out t-tests.

Obviously I can write code to do this but most likely someone has doone this already. Can anyone provide a pointer to such code?

David Scott

David Scott	Department of Statistics, Tamaki Campus
 		The University of Auckland, PB 92019
 		Auckland 1142,    NEW ZEALAND
Phone: +64 9 373 7599 ext 86830		Fax: +64 9 373 7000
Email:	d.scott_at_auckland.ac.nz

Graduate Officer, Department of Statistics Director of Consulting, Department of Statistics

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