st: Merge data

["Lok Wong" <lokwong80@hotmail.com>]

Hi,there,

I have one question about merging data..I am wondering if someone out there 
could help me with it.

Let's say data sets, A and B.. A includes {X1,X2,X3,X4} and B 
includes{X1,X2,X5}..Using X1 and X2, we could uniquely identify the 
individuals in the data...Moreover,the sample size of B is bigger that of 
A..I only want X5 of individuals in B who are also in A...How could I do 
this?

Thanks a lot..

Lok

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