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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 15:38:18 +0000
(Ignore the comment about negatives. You were perfectly clear on that.)
Nick
[email protected]
On 25 February 2014 15:37, Nick Cox <[email protected]> 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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