Dear Stata users,

I have a panel data set with 14 string variables each of which indicates whether this type of service is provided (one variable per service), and if it is, by what means.
These variables can take values "NP", "Comb", "Other gov", "Own gov", "Private", "RDC".

I would like to create a count variable "total" indicating the number of services provided for each observations. This variable would most likely count the number of "NP"s in all 14 variable for a given id-year, and subtract that from 14 (because 14 is the maximum number of services provided, subtracting the number of those not provided would give me what I need). I have not been able to find any way of doing this in Stata, so I wanted to ask for advice. Please let me know if this information is insufficient or unclear.

Thank you!