[Limdep Nlogit List] Error 127: Models - Sample sum of weights is less than or equal to 1.0
maria.vrachioli at ufl.edu
Tue Jun 7 07:28:34 AEST 2016
I am using NLOGIT's usual format for sample selection models PROBIT and FRONTIER command.
While this model is working for the pooled data (N=265) and treated farmers data (N=231), it gives me the following error
when I am trying to run this model using the control group of farmers (N=31):
|-> FRONTIER ; Lhs = loutput ; Rhs = one,lcapital,llabour,lland ; Selection $
Error 127: Models - Sample sum of weights is less than or equal to 1.0
(it gives me the same error using or not Halton for the simulation)
I do not know how to interpret this error and what it would solve this issue.
My command for the sample selection model for the control group is the following:
PROBIT ; Lhs = extension ; Rhs = one,age,age2,educ,educ2,subsidies,tenancy,aridity,altitude ; Hold $
FRONTIER ; Lhs = loutput ; Rhs = one,lcapital,llabour,lland ; Selection $
; Halton ; Draws = 100 $
I am using a Cobb-Douglas production function with only 3 inputs, as I know that my data set for the control group is relatively small.
I would like to thank you in advance for your help.
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