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Re: st: How can I count the number of variables that meet a certain condition per observation?


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: How can I count the number of variables that meet a certain condition per observation?
Date   Sat, 3 Dec 2011 15:35:40 +0000

In addition to Daniel's reply

gen count = 0
gen sum = 0

forval j = 101/110 {
        replace count = count + ( var'j' > 1 )
         replace sum = sum + var'j' if var'j'  > 1


}

where ' ' are to be understood as left single quote ... right single quote.

Nick

On 3 Dec 2011, at 11:49, "Schreck, Philipp" <schreck@bwl.lmu.de> wrote:

Dear list members,

Say my dataset includes 10 observations and 10 variables, var101- var110. Entries can take values 0, 1, or 2 (I use Stata/SE 11).

I would like to count for each observation the number of variables that meet a certain condition, say var*==2. Although I searched the list, I cannot find the appropriate command and would be very grateful for any suggestions. I could loop over var101-var110 and (for each var) generate a new variable with value "1" if the respective variable is greater than 1 (and then use -rsum- with the new variables). But that seems overly complicated and I was wondering whether there's an easy command I've been missing.

Maybe it could be something like:

egen varcount = rowtotal (var101-var110)

but then I get the sum of all values (across vars) per observation which is not what I want.

Is there a simple way of computing the sum across variables (for each observation) ONLY for those variables with values greater than 1 (or, alternatively, the number of variables with values greater than 1 per observation)?


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