Katsuhide Isa wrote:
> As to the 1st question, when I ran the following,
>
> >foreach var of varlist A-D{
> > count if `var' == 0
> > local sum = `sum' + r(N)
> > }
> >di `sum'
>
> following error messages are shown:
>
> Unknown function +r()
> r(133);
The problem is, that the local macro `sum' isn't defined in the first round of
the loop.
local sum 0
foreach var of varlist A-D {
count if `var' == 0
local sum = `sum' + r(N)
}
di `sum'
should work. This is nicer than your solution in that you save one command
inside the loop. However with just four loops this will not make any
difference.
> But this time, after numbers of zeros for each variable and
> total sum of zeros are vertically shown, following error
> messages appear:
> # The same messages are shown after running the statements
> pertaining to the 2nd question.
>
> no; data in memory would be lost
> r(4);
This message does not stem from the snippet above. If you load several files
in a loop you should load them with -use filename, clear-. However it might
be an idea to merge/append the files toghether before starting the analysis.
many regards
uli
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