I have written the following very simple program
cap pr drop logdiff
program define logdiff , rclass byable(recall)
syntax varlist(min=2 max=2) [if] [in] [fweight aweight]
version 8.0
tempvar dif
marksample touse
qui count
local N = r(N)
qui count if `touse'
if r(N) == 0 error 2000
local n = r(N)
qui gen `dif' = (`n'/`N')*abs(ln(`2') - ln(`1')) if `touse'
qui su `dif' if `touse' [`weight'`exp'] , meanonly
loc diff = r(mean)
di as text "Log Difference: " as result `diff'
return scalar diff = `diff'
return local N = `N'
return local n = `n'
end
My questions are:
[1] How can I return the results for all categories when I use the by option and not only for the last category?
[2] How can I display and return the results for the total of a category when I use the by option? i.e. return the same results as without the by option.
[3] How can I exclude the missing values from my estimations both when I use and not use the by option?
Thanks in advance
Nikos
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