Re: st: example about choice experiment datasheet

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