st: frontier - "initial values not feasible"

[Georgeta Vidican <gvidican@MIT.EDU>]

Hi there,

I need some help in running a stochastic frontier analysis.

I am using the command "frontier", with output as the dependent  
variable, and a series of inputs to estimate the Cobb-Douglas  
production function, on a sample of 528 farms.

However, I get the following error message "initial values not  
feasible".

Could anyone suggest where the problem comes from?

Many thanks.

Georgeta
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