[R] multiple t-tests across similar variable names
smartpink111 at yahoo.com
Thu Oct 11 05:27:35 CEST 2012
A typo in my solution:
----- Original Message -----
From: "Nundy, Shantanu" <snundy at chicagobooth.edu>
To: "r-help at r-project.org" <r-help at r-project.org>
Sent: Wednesday, October 10, 2012 7:09 PM
Subject: Re: [R] multiple t-tests across similar variable names
I have a dataset with multiple "pre" and "post" variables I want to compare. The variables are named "apple_pre" or "pre_banana" with the corresponding post variables named "apple_post" or "post_banana". The variables are in no particular order.
apple_pre orange_pre orange_post pre_banana apple_post post_banana
How do I:
1. Run a series of paired t-tests for the apple_pre variables and pre_banana variables? Would be great to do something like ttest(*.*pre*.*,*.*post*.*).
2. Print the results from these t-tests in a table with col 1=mean difference, col 2= 95% conf interval, col 3=p-value.
Thank you kindly,
Shantanu Nundy, M.D.
University of Chicago
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