[Limdep Nlogit List] Error 127: Models - Sample sum of weights is less than or equal to 1.0

William Greene wgreene at stern.nyu.edu
Thu Jun 9 03:48:11 AEST 2016


Maria.  Create control = 1 - extension
then fit the model as
PROBIT ; Lhs = control ; ... $
FRONTIER ; ... $
This should make the 127 error go away.
/Bill Greene

On Mon, Jun 6, 2016 at 5:28 PM, Vrachioli,Maria <maria.vrachioli at ufl.edu>
wrote:

> Hello,
>
>
> 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.
>
> Best regards,
> Maria
>
>
> _______________________________________________
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> Limdep at limdep.itls.usyd.edu.au
> http://limdep.itls.usyd.edu.au
>



-- 
William Greene
Department of Economics
Stern School of Business, New York University
44 West 4 St., 7-90
New York, NY, 10012
URL: http://people.stern.nyu.edu/wgreene
Email: wgreene at stern.nyu.edu
Ph. +1.212.998.0876


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