Hello everyone! 
First, I have to mention that I am an absolute beginner in both Stata and SFA, so lots of questions may follow.
I am trying to perform SFA on a production function with multiple-outputs and inputs, using panel data.
In particular, I have 3-years information about 3000 banks, with output (Loans, Securities and Off-balance sheet item) and inputs (Employees, Fixed assets, Deposits and Funding).
So far, I found out that I have to use the xtfrontier command, but it allows a single dependent variable. I found out that multi-output analysis is also possible, but still cannot understand how it can be performed.
Can you please give me some hints?
Thank you in advance!
BR
Sisi

First, I have to mention that I am an absolute beginner in both Stata and SFA, so lots of questions may follow.
I am trying to perform SFA on a production function with multiple-outputs and inputs, using panel data.
In particular, I have 3-years information about 3000 banks, with output (Loans, Securities and Off-balance sheet item) and inputs (Employees, Fixed assets, Deposits and Funding).
So far, I found out that I have to use the xtfrontier command, but it allows a single dependent variable. I found out that multi-output analysis is also possible, but still cannot understand how it can be performed.
Can you please give me some hints?
Thank you in advance!
BR
Sisi