define a dummy with cond()

[River Huang]

Dear All, Suppose the data set is

* Example generated by -dataex-. For more info, type help dataex
clear
input float n int rep78
 1 3
 2 3
 3 .
 4 3
 5 4
 6 3
 7 .
 8 3
 9 3
10 3
11 3
12 2
13 3
14 3
15 4
16 3
17 2
18 2
19 3
20 5
end

My command is

gen d = cond(rep78>2,1,0)

However, I need `d' to be missing for the 3rd and 7th observations. I wonder the command `cond()' can do this?

[Nick Cox]

I am fond of cond() but the code you cite has no clear advantage over

gen d = rep78 > 2

but either way you can go

gen d = rep78 > 2 if rep78 < .

or

gen d = cond(rep78 > 2, 1, 0) if rep78 < .

or

gen d = cond(missing(rep78), ., rep78 > 2)

or yet other ways should now occur to you.

See also (for example)

https://www.stata.com/support/faqs/d...rue-and-false/

https://www.stata-journal.com/articl...article=dm0099

[River Huang]

Dear Nick, Thanks a lot.