Dears,

I have a question regarding the command lclogitwtp2.
why lclogitwtp2, cost(price) post with a constrain of the type constraint 1 [Class1]price =0 reports an error and does not calculate the ratios for class2 only?



Willingness-to-pay (WTP) coefficients

--------------------------------
WTP for | Class1 Class2
-------------+------------------
ASC_1 | . 0.926
ASC_2 | . 0.349
ASC_3 | . -1.069
--------------------------------

Please wait: -nlcom- is calculating standard errors for the WTP coefficients.

expression (_b[Class1:ASC_1] / (-1 * _b[Class1:price])) evaluates to missing
r(498);

Is there a solution.

Thanks
Federica