Dear Ulrich,
Thank you for your advice.
2nd question has been solved, thanks to your advice.
As you pointed out, -local- was merely redundant.
Admittedly, I surely made elementary mistakes.
# though some trouble still remains, as mentioned below.
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);
Then, I tried the slightly modified statements below:
foreach var of varlist A-D{
count if `var' == 0
local i = r(N)
local sum = `sum' + `i'
}
di `sum'
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);
Actually, I try to process multiple dta files using
foreach file in mat1982 mat1983 mat1984{
...
}
in the same do file, which might have provoked these messages.
I'd appreciate additional advice.
K.I.
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