Hi Nick Cox


I want to add and multiply certain variables in stata in a new variable VaR. My expression is:

gen VaR=constant_term+ (coeff_L_Tbills* L_Tbills)+ (coeff_L_Inf* L_Inf)

Now the issue is that, for some rows where when L_Inf is missing or 0, the whole outcome VaR of the equation becomes zero. which shouldn't be otherwise if calculated manually.

How can I amend the above code, to get the correct equation.

Best Regards