[R] how to compare two datasets in R>?

[David Winsemius]

On Nov 2, 2010, at 2:14 AM, song song wrote:

> hi, everybody, my question is:
>
> suppose I have two data sets, set A is large and have variables like  
> ID,
> Gender, Income.  Set B is small and suppose only has ID.
>
> Now I want to get a subset from data set A which contains ID from  
> Set B.

Try:

A[A$ID %in% B$ID, ]

Or:

subset(A, ID %in% B$ID)


>
> How to do this in R>?  Is there any commands to do this?
>
> Thank you
>
> 	[[alternative HTML version deleted]]
--

David Winsemius, MD
West Hartford, CT