[Limdep Nlogit List] Interaction between ASC and socio-economic variables

Thu Jun 18 18:27:08 AEST 2020

You can try put in your syntax: 
	;rpl=sociodemographic variables
                ;Fcn=ASC(n), b1(n|#00000),.......

The b1(n|#00000) implies that the coef. for the choice attributes are randomly distributed but not conditionally to the sociodemographic variables. 

Ioanna 

>-----Original Message-----
>From: Limdep [mailto:limdep-bounces at mailman.sydney.edu.au] On Behalf
>Of Fredrik Carlsson
>Sent: 18. kesäkuuta 2020 11:16
>To: F WD
>Cc: Limdep and Nlogit Mailing List
>Subject: Re: [Limdep Nlogit List] Interaction between ASC and socio-economic
>variables
>
>You can’t interact with an ASC in U(1,2) since you don’t have an ASC there
>then.
>
>F
>
>From: F WD [mailto:fannywidadie at gmail.com]
>Sent: Thursday, 18 June 2020 09:26
>To: Fredrik Carlsson <fredrik.carlsson at economics.gu.se>
>Cc: Limdep and Nlogit Mailing List <limdep at mailman.sydney.edu.au>
>Subject: Re: [Limdep Nlogit List] Interaction between ASC and socio-economic
>variables
>
>Dear Fredik Carlsson,
>
>Actually, I don't use ASC in the second utility function in my model. I made a
>mistake to write the syntax in the previous mail. I use the syntax as below:
>
>RPLOGIT   ; Lhs = CHOICE ; Choices = 1,2,3
>;model:
>U(1,2) = PRICE*PRICE + X76*X76 + HANDLING*HANDLING + X62*X62 +
>X63*X63 + LOCATION*LOCATION + X65*X65 + QUANTITY*QUANTITY +
>AGE*ASCXAGE + EDUC*ASCXEDUC + ORGANIC*ASCXORGA + RISK*X104 +
>KTPA*ASCXKTPA + COMMUNITY*ASCXKTCO + INCOME*ASCXINCO /
>U (3) =  ASC + PRICE*PRICE + X76*X76 + HANDLING*HANDLING + X62*X62 +
>X63*X63 + LOCATION*LOCATION + X65*X65 + QUANTITY*QUANTITY
>; fcn = ASC(n), Price(c), X76(n), HANDLING(n), X62(n), X63(n), LOCATION(n),
>X65(n), QUANTITY(n)
>; Maxit = 50 ; Pts = 25 ; Halton ; Output = 3 ; Pds = 3 $
>
>when I run the result is Error   1027: Models - estimated variance matrix of
>estimates is singular..
>
>
>Pada tanggal Kam, 18 Jun 2020 pukul 00.40 Fredrik Carlsson
><fredrik.carlsson at economics.gu.se<mailto:fredrik.carlsson at economics.gu.se
>>> menulis:
>You have an ASC in all utility fcns in the second specification
>
>Best
>Fredrik
>
>Skickat från min iPhone
>
>> 17 juni 2020 kl. 16:51 skrev F WD via Limdep
><limdep at mailman.sydney.edu.au<mailto:limdep at mailman.sydney.edu.au>
>>:
>>
>> Dear all,
>>
>> I am using a mixed logit model to estimate the preferences. In my model,
>> there are two types of alternatives and a status quo (alternative specific
>> constants). So basically, I had three utility functions. When I tried to
>> estimate the basic model without interaction with some socio-economic
>> variables, it works. However, When I tried to add the model with
>> interaction between ASC and socio-economic variables, it did not work. As
>> for your information, I use ASC to measure utility of status quo
>> alternative. I use dummy variable coding 1 if the respondent chooses the
>> status quo, and 0 otherwise. I want to know the effect of socio-economic
>> variable on the probability to opt “status quo”.
>>
>> The syntax of mixed logit is below for basic model and it run well
>>
>> RPLOGIT   ; Lhs = CHOICE ; Choices = 1,2,3
>>
>> ;model:
>>
>> U(1,2) = PRICE*PRICE + X76*X76 + HANDLING*HANDLING + X62*X62 +
>X63*X63      +
>> LOCATION*LOCATION + X65*X65  +  QUANTITY*QUANTITY /
>>
>> U (3) =  ASC + PRICE*PRICE + X76*X76 + HANDLING*HANDLING + X62*X62 +
>> X63*X63 + LOCATION*LOCATION + X65*X65 + QUANTITY*QUANTITY
>>
>> ; fcn = ASC(n), Price(c), X76(n), HANDLING(n), X62(n), X63(n), LOCATION(n),
>> X65(n), QUANTITY(n)
>>
>> ; Maxit = 50 ; Pts = 25 ; Halton ; Output = 3 ; Pds = 3 $
>>
>>
>>
>> However, when I run to interact between ASC and some socio-economic
>> variables, it does not work.  I got the message: *Error   1027: Models -
>> estimated variance matrix of estimates is singular*
>>
>> I use the syntax below:
>>
>> RPLOGIT   ; Lhs = CHOICE ; Choices = 1,2,3
>>
>> ;model:
>>
>> U(1,2) = ASC + PRICE*PRICE + X76*X76 + HANDLING*HANDLING + X62*X62
>+
>> X63*X63 + LOCATION*LOCATION + X65*X65 + QUANTITY*QUANTITY +
>AGE*ASCXAGE +
>> EDUC*ASCXEDUC + ORGANIC*ASCXORGA + RISKst*ASCXRISK +
>KTPA*ASCXKTPA +
>> COMMUNITY*ASCXKTCO /
>>
>> U (3) = ASC + PRICE*PRICE + X76*X76 + HANDLING*HANDLING + X62*X62 +
>X63*X63
>> + LOCATION*LOCATION + X65*X65 + QUANTITY*QUANTITY
>>
>> ; fcn = ASC(n), Price(c), X76(n), HANDLING(n), X62(n), X63(n), LOCATION(n),
>> X65(n), QUANTITY(n),
>>
>> ; Maxit = 50 ; Pts = 25 ; Halton ; Output = 3 ; Pds = 3 $
>>
>>
>>
>> Does anyone know why the model in the interaction is not run? Is there any
>> wrong in the syntax? Thank you for your help.
>>
>> best regards,
>> F
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>
>
>--
>
>Fanny Widadie, S.P., M.Agr
>Department of Agricultural Economics and Agribusiness
>Faculty of Agriculture
>University of Sebelas Maret
>Jalan Ir. Sutami No. 36 A Kentingan Surakarta - Central Java
>Indonesia 57126
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