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Re: st: row means for at least 10 observations greater than 0
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: row means for at least 10 observations greater than 0
Date
Tue, 25 Feb 2014 15:37:36 +0000
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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