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Re: st: example about choice experiment datasheet


From   Arne Risa Hole <arnehole@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: example about choice experiment datasheet
Date   Fri, 23 Nov 2012 14:18:02 +0000

Elisabetta

I am fairly sure that you can use -asclogit- to do what you want. If
you don't want alternative-specific constants you can use the
-noconst- option. Modifying the example in the help-file slightly:

webuse choice
asclogit choice dealer, case(id) alternatives(car) noconst

As you can see the only coefficient which is estimated in this case is
the one for the dealer attribute, which is analogous to the organic
and price attributes in your experiment. In your case the variable
that identifies the alternatives for each case ("car" in the example)
can simply take the values 1, 2, 3 and 4 since your alternatives are
unlabelled.

I also recommend taking a look at a basic choice modelling text before
proceeding, such as
http://books.google.co.uk/books/about/Applied_Choice_Analysis.html?id=8yZrtCCABAgC.

Good luck!

Arne

On 23 November 2012 13:25, elisabetta capobianco
<elisabetta.capobianco@gmail.com> wrote:
> 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/
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> 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:
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>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> *
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>>>>>>> *   http://www.stata.com/support/faqs/resources/statalist-faq/
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>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> 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/
>
>
>
> --
> 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/

*
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