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Re: st: row means for at least 10 observations greater than 0


From   Jeph Herrin <[email protected]>
To   [email protected]
Subject   Re: st: row means for at least 10 observations greater than 0
Date   Tue, 25 Feb 2014 11:11:07 -0500

Or - in the interests of brevity - if you have say 25 variables

 	egen has0s   = anycount(var1990-var2014), val(0)
	egen rowmean = rowmean(var1990-var2014) if (25 - has0s) >=10


J




On 2/25/2014 10:37 AM, Nick Cox wrote:
Let's count positives first. One simple way is a loop. I imagine
variable names -var1990-var2013-. I throw in free a check for
non0missing.

gen positive = 0

qui foreach v of var var1990-var2013 {
       replace positive = positive + (`v' > 0 & `v' < .)
}

egen rowmean = rowmean(var1990-var2013) if positive >= 10.

For technique here see

SJ-9-1  pr0046  . . . . . . . . . . . . . . . . . . .  Speaking Stata: Rowwise
         (help rowsort, rowranks if installed) . . . . . . . . . . .  N. J. Cox
         Q1/09   SJ 9(1):137--157
         shows how to exploit functions, egen functions, and Mata
         for working rowwise; rowsort and rowranks are introduced

http://www.stata-journal.com/sjpdf.html?articlenum=pr0046

(If negative values are acceptable, modify the loop accordingly.)

Nick
[email protected]

On 25 February 2014 15:30, Nicholas Winters
<[email protected]> wrote:
I need to take an average of several variables in a row, but I want to average of the row only if there are at least 10 variables without 0 as their observation. The data looks like this:

PersonID  1990 1991 1992 1993 1994 1995 etc...
1               0       0       3      3      5       6
2               1       1       5      3      0       7
3               1       1       2      1      4       3
4               0       0       0      0      5       5

does anyone have an idea how to do this? I've tried egen and rowmean() but I am not sure how to code for if a row has more at least 10 observations > 0
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