These are functions that I've written to perform basic tasks in R that are often encountered in my research as a sociologist. 
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Custom R Functions
Selection  File type icon  File name  Description  Size  Revision  Time  User 

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This function, written by Andrew Gelman, in the arm package does an attach() that overwrites the current variable that is being attached instead of copying into R's liminal state. Very useful when working with big datasets with lots of variables.  1k  v. 2  Jan 26, 2010, 6:44 AM  David Eagle  
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This is a function that searches through the variable names in a dataframe and returns the matches. Does not search labels, but could easily be extended to do that, too.  1k  v. 1  Aug 17, 2010, 11:10 AM  David Eagle  
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Written by Paul Johnson, this extremely useful function creates "tight" regression tables (a la outreg in STATA) in R. This version prints p values at p<.01,p<.05,p<.001. I will also fix the way it prints column headings, but that will be in the next version!  6k  v. 4  Jan 20, 2010, 8:05 AM  David Eagle  
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Prints significance stars for various pvalues. Useful when wanting to output stars to a regression table to print in Latex or Excel.  1k  v. 1  Jan 3, 2010, 9:57 PM  David Eagle  
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These are functions that return Rsquared for lm models and pseudo Rsquared for glm models.  1k  v. 1  Feb 1, 2010, 1:48 PM  David Eagle 