I am no STATA guru, so this may be simple, but I cannot find guidance anywhere (probably because I don't know how to word my search).

Where respondents can choose multiple responses, I get data output for each variable in the form of "checked" and "unchecked". Thus I know how many people chose each option. However, because some may have selected multiple options and some may have left the question blank, I don't know how to figure out

1) how many respondents in total responded (rather than just leaving everything blank) and
2) how many respondents in each demographic sub-category responded

I suspect knowing how to calculate 1) may make 2) possible, but I thought I would include it in case it doesn't .

Thank you for guidance and apologies if this is obvious! Happy to be directed to a help sheet or something to read for myself if you know of one!

Jane