calculating mean

[tony]

Hi, there
surppose there is a variable, cigs, which show the number of one somke per day, 0 means no smoking. And I want to calculate the mean of
those take cigarrets. How to do that?

Thank you, all

[startz]

Look at the help system for @mean

[tony]

Look at the help system for @mean

I read the help, but I have no idea about this, could you show me the right way.
Thank you.

[startz]

series y =@mean(cigs)

[tony]

No, I mean y=@mean(cigs, in which cigs not equal to 0).
Say there are 50 observations in which 30 observations equal 0.
I just want to calculate the mean of the rest 20, and how to do this using a command function.
Thank you.

[startz]

smpl if cigs>0
series y=@mean(cigs)

or set the smpl and then open cigs and view stats

[tony]

Thanks a lot!