Hi all,
I am working with some social network analysis in R and ran into a problem I
just cannot solve.
Each observation in my data consists of a respondent, some characteristics
and up to five friends. The problem is that all of these five friends might
no show up later as a respondent (observation). Therefore I might not have
characteristics 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 NA ID6 ID2 ID53
ID2 ID1 ID4 ID17 NA NA
I thought I could check if for each entry, the value goes again in a list of
the respondents.
How do I do this?
Kind regards,
Frederik
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