Saving part of a dataset

[Guest]

Hi, I have 33 variables and 1000 participants. The 33rd variable has 20 participants with data entered. The 980 other participants have missing data. All other variables have basically complete data.
I want to save a new dataset containing just the 20 participants with data for the 33rd variable. I want the new dataset to include all 33 variables for those 20 participants.
Is there a way to do this?

Thanks

[Nick Cox]

save does not support if so you need

keep if !missing(var33) 
save mydata

although savesome (SSC) is a wrapper for the same kind of two-step operation,

[Carlo Lazzaro]

Guest:
first of all, I would save a copy of the original dataset.
Then, I would try:

drop if 33_rd==.

PS: crossed in the cyberspace with Nick's helpful advice, that deals with the same matter from the opposite end of the wire (-keep- vs -drop-).