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From |
Arne Risa Hole <arnehole@gmail.com> |

To |
statalist <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: example about choice experiment datasheet |

Date |
Sat, 24 Nov 2012 16:42:43 +0000 |

Elisabetta, The "case" variable must a unique identifier for each choice. You can generate it like this egen caseid = group(id scenario) The "alt" variable should be coded 1,2,3,4,1,2,3,4 etc. (not 1,2,3,4,5,6,7,8,...). Arne On 24 November 2012 16:04, elisabetta capobianco <elisabetta.capobianco@gmail.com> wrote: > Thank you Arne, I have taken the book. > My problem is that I have 16 scenarios for id (n=131) with 4 different > alternatives for each scenario . > So in the dataset I have written for each id non 4 alternatives > (1,2,3,4) but 64 alternatives. Is it correct? > > > > id scenario alt > 1 1 1 > 1 1 2 > 1 1 3 > 1 1 4 > 1 2 5(or1?) > 1 2 6(or2?) > 1 2 7(or3?) > 1 2 8 (or4?) > 1 3 9(or1?) > . > . > . > . > . > 1 16 64 > 2 1 1 > . > . > And when I wrote: > asclogit choice organic price, case(id) alternatives(car) noconst > > case is id or scenario? I suppose scenario. But if is scenario I don't > know how to use id! > And alternatives are the 64 alternatives? > > > Thank you so much for your help. > > elisabetta > > > > > > 2012/11/23 Arne Risa Hole <arnehole@gmail.com>: >> 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: >>>>>>>>>>> * 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/ >>> >>> >>> >>> -- >>> 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/ * * 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/

**Follow-Ups**:**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**References**:**st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*"JVerkuilen (Gmail)" <jvverkuilen@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <arnehole@gmail.com>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <elisabetta.capobianco@gmail.com>

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