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Re: st: example about choice experiment datasheet


From   elisabetta capobianco <elisabetta.capobianco@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: example about choice experiment datasheet
Date   Fri, 23 Nov 2012 14:25:03 +0100

I think that asclogit is not the right comand for me.
Because I have 4 unlabeled alternatives, 16 diferrent scenarios with 4
alternatives for 131 individuals. So my indipendent viariables are the
attributes and dipendent variables the utility for each level of
attribute.
I need to know the importance of every level, not of alternatives.
Ex.:n=131
scenario 1)   A       B        C         D
     organic  org   no org   no org   org
     price       4         8         4         4
scenario 2)   A      B         C        D
    organic  no org  no org   org     no org
      price     12     16         8        8
.
.
.
Perhaps with mixlogit? Because the example is on a specific
alternative, car or bus.
I instead need to know the coefficient of attributes and levels.

I don't know if I have explained well, I hope!

e



2012/11/23 Arne Risa Hole <arnehole@gmail.com>:
> -help asclogit_postestimation-
>
> Arne
>
> On 23 November 2012 11:05, elisabetta capobianco
> <elisabetta.capobianco@gmail.com> wrote:
>> Dear Arne,
>> i need to estimate the marginal effect of levels on attributes of my choice.
>> Is it possible?
>> es:
>> about meat:
>> attribute   level
>> label        organic/not organic
>> origin       local abroad
>> prize        4/8
>>
>> I would know the utility for each level of each attribute.
>>
>> Thank you!
>> elisabetta
>>
>>
>>
>> 2012/11/21 elisabetta capobianco <elisabetta.capobianco@gmail.com>:
>>> Thank you so much Arne!!!
>>> I'm creating the data set and then i'll try to run in Stata!
>>>
>>> Elisabetta
>>>
>>> 2012/11/20 Arne Risa Hole <arnehole@gmail.com>:
>>>> Elisabetta
>>>>
>>>> -mlogit- is not very useful to model data from choice experiments as
>>>> it does not allow alternative-specific explanatory variables.
>>>> -asclogit- requires your data to be in long form (one row per
>>>> alternative); see -help asclogit- and the first example in the paper I
>>>> mentioned in my last email.
>>>>
>>>> Arne
>>>>
>>>> On 20 November 2012 10:04, elisabetta capobianco
>>>> <elisabetta.capobianco@gmail.com> wrote:
>>>>> Thank you Arne, I want to use asclogit and mlogit for my choice modelling.
>>>>>
>>>>>
>>>>> 2012/11/19 Arne Risa Hole <arnehole@gmail.com>:
>>>>>> Elisabetta
>>>>>>
>>>>>> As Jay says the correct data form depends on the estimation command
>>>>>> you are planning to use, so this is a very important piece of
>>>>>> information that you haven't given us. You may find the examples in
>>>>>> http://www.stata-journal.com/article.html?article=st0133 useful.
>>>>>> Generally speaking the best strategy is to import the data into Stata
>>>>>> and then use commands like -reshape- to convert the data into the form
>>>>>> you want, rather than trying to do this in Excel.
>>>>>>
>>>>>> Arne
>>>>>>
>>>>>>> On 19 November 2012 15:51, elisabetta capobianco
>>>>>>> <elisabetta.capobianco@gmail.com> wrote:
>>>>>>>>
>>>>>>>> Thank you for your answer!
>>>>>>>> I want to do a mixed logit, but I have found a data set on help file
>>>>>>>> with just one choice set. I have 16 choice sets and I don't know how
>>>>>>>> to fil the excel data set.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> 2012/11/18 JVerkuilen (Gmail) <jvverkuilen@gmail.com>:
>>>>>>>> > On Sun, Nov 18, 2012 at 4:11 AM, elisabetta capobianco
>>>>>>>> > <elisabetta.capobianco@gmail.com> wrote:
>>>>>>>> >> Hi, I'm new of statalist and stata!
>>>>>>>> >> I'm working on choice experiment about food preferences in schools.
>>>>>>>> >> I have 4 alternatives unlabelled, 4 attributes and 4 levels, 130
>>>>>>>> >> individuals.
>>>>>>>> >> I have the data base in excel, but before insheet the file in stata
>>>>>>>> >> i'm not sure that i have put the data in the right mode in the excel
>>>>>>>> >> file.
>>>>>>>> >> Have you got an example on a excel datasheet about choice modelling?
>>>>>>>> >> Just an example to understand how to organize my datasheet.
>>>>>>>> >
>>>>>>>> > It depends on what analysis you want to use. -clogit- and procedures
>>>>>>>> > like it that are using alternative-specific predictors use the same
>>>>>>>> > basic format, which is specified in the help file. You can see the
>>>>>>>> > example dataset there. Essentially it is a "long" format like
>>>>>>>> > person-period in a growth model with time-varying covariates.
>>>>>>>> > *
>>>>>>>> > *   For searches and help try:
>>>>>>>> > *   http://www.stata.com/help.cgi?search
>>>>>>>> > *   http://www.stata.com/support/faqs/resources/statalist-faq/
>>>>>>>> > *   http://www.ats.ucla.edu/stat/stata/
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
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>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>           Le informazioni contenute in questa comunicazione e gli
>>>>>>>> eventuali documenti allegati
>>>>>>>>
>>>>>>>>           hanno carattere confidenziale e sono a uso esclusivo del
>>>>>>>> destinatario. Nel caso
>>>>>>>>
>>>>>>>>           questa comunicazione Vi sia pervenuta per errore, Vi informo
>>>>>>>> che la sua diffusione
>>>>>>>>
>>>>>>>>           e riproduzione è contraria alla legge e prego di darmi
>>>>>>>> prontamente avviso
>>>>>>>>
>>>>>>>>           e di cancellare quanto ricevuto. Grazie.
>>>>>>>>
>>>>>>>> *
>>>>>>>> *   For searches and help try:
>>>>>>>> *   http://www.stata.com/help.cgi?search
>>>>>>>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>>>>>>>> *   http://www.ats.ucla.edu/stat/stata/
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> *
>>>>>> *   For searches and help try:
>>>>>> *   http://www.stata.com/help.cgi?search
>>>>>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>>>>>> *   http://www.ats.ucla.edu/stat/stata/
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail
>>>>>
>>>>>
>>>>>
>>>>>           Le informazioni contenute in questa comunicazione e gli
>>>>> eventuali documenti allegati
>>>>>
>>>>>           hanno carattere confidenziale e sono a uso esclusivo del
>>>>> destinatario. Nel caso
>>>>>
>>>>>           questa comunicazione Vi sia pervenuta per errore, Vi informo
>>>>> che la sua diffusione
>>>>>
>>>>>           e riproduzione è contraria alla legge e prego di darmi
>>>>> prontamente avviso
>>>>>
>>>>>           e di cancellare quanto ricevuto. Grazie.
>>>>>
>>>>> *
>>>>> *   For searches and help try:
>>>>> *   http://www.stata.com/help.cgi?search
>>>>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>>>>> *   http://www.ats.ucla.edu/stat/stata/
>>>>
>>>> *
>>>> *   For searches and help try:
>>>> *   http://www.stata.com/help.cgi?search
>>>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>>>> *   http://www.ats.ucla.edu/stat/stata/
>>>
>>>
>>>
>>> --
>>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail
>>>
>>>
>>>
>>>           Le informazioni contenute in questa comunicazione e gli
>>> eventuali documenti allegati
>>>
>>>           hanno carattere confidenziale e sono a uso esclusivo del
>>> destinatario. Nel caso
>>>
>>>           questa comunicazione Vi sia pervenuta per errore, Vi informo
>>> che la sua diffusione
>>>
>>>           e riproduzione è contraria alla legge e prego di darmi
>>> prontamente avviso
>>>
>>>           e di cancellare quanto ricevuto. Grazie.
>>
>>
>>
>> --
>> Rispetta l'ambiente: se non ti è necessario, non stampare questa mail
>>
>>
>>
>>           Le informazioni contenute in questa comunicazione e gli
>> eventuali documenti allegati
>>
>>           hanno carattere confidenziale e sono a uso esclusivo del
>> destinatario. Nel caso
>>
>>           questa comunicazione Vi sia pervenuta per errore, Vi informo
>> che la sua diffusione
>>
>>           e riproduzione è contraria alla legge e prego di darmi
>> prontamente avviso
>>
>>           e di cancellare quanto ricevuto. Grazie.
>>
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
>> *   http://www.ats.ucla.edu/stat/stata/
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/faqs/resources/statalist-faq/
> *   http://www.ats.ucla.edu/stat/stata/



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          Le informazioni contenute in questa comunicazione e gli
eventuali documenti allegati

          hanno carattere confidenziale e sono a uso esclusivo del
destinatario. Nel caso

          questa comunicazione Vi sia pervenuta per errore, Vi informo
che la sua diffusione

          e riproduzione è contraria alla legge e prego di darmi
prontamente avviso

          e di cancellare quanto ricevuto. Grazie.

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


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