search for: id53

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2011 Apr 20
1
How to check if a value of a variable is in a list
...on all the friends listed in the data and I want to restrict my data to only those friends that I also have as respondents. The data (without characteristics) look like this: *resp f1 f2 f3 f4 f5* ID1 ID5 ID37 ID6 ID2 ID53 ID2 ID1 ID4 ID17 NA NA ... Now, let's say that "ID37" never appears as a respondent, then I want to replace that value with a NA so that it looks like this: *resp f1 f2 f3 f4 f5* ID1 ID5...