Dear all,
I am learning how to estimate Choice models in Stata 16. I have the following data example extracted from a cross sectional dataset of a 123 Survey.
I want to explain sector of employment choice (variable : SECTAT). When I comset the data , I get the following error message.

all choice sets have only one alternative
r(2000);

code used : cmset id SECTACT

#
[CODE]
* Example generated by -dataex-. To install: ssc install dataex
clear
input byte SECTACT float wage byte female float(maristatus age years_edu formal exper) byte FORIN
1 52127.18 1 2 31 17 1 5 1
3 169000 0 2 44 11 1 17 1
1 600000 0 2 37 16 1 5 1
2 378407.3 0 6 59 17 1 31 1
4 300000 1 1 25 2 2 2 2
end
#
I am wondering if there is a way to reshape the dataset so as to be able to comset it.

Thank you for your help.

Jean