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st: replacing zero length strings with missing values


From   Robert.Shaw@dh.gsi.gov.uk
To   statalist@hsphsun2.harvard.edu
Subject   st: replacing zero length strings with missing values
Date   Tue, 4 Sep 2012 12:54:19 +0100

Hi

I have a large dataset in stata and one of the variables has a lot a observations that should be missing values but are instead zero length strings (ie. =="")

I've tried

foreach x of varlist myvariable {
replace `x' = . if(`x' =="")
}

but this gives a type mismatch.

Can anyone help please?

Thanks
Rob Shaw
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