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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 |
Tue, 27 Nov 2012 11:45:07 +0000 |

You are welcome. -mixlogit- implements the same model as -asclogit- but with random coefficients. You should make sure that you understand the differences between the models before moving on to -mixlogit-, as this is a more complicated model. Arne On 27 November 2012 05:31, elisabetta capobianco <elisabetta.capobianco@gmail.com> wrote: > Dear Arne, > you're my very helpful, thank you so much. > Now i'm trying to use mix logit, I've ridden your article. It seems to > be better than asclogit, because i have different alternatives on N > choices occasion. Is it more correct for my case, isn't it? > > Thank you! > > elisabetta > > 2012/11/26 Arne Risa Hole <arnehole@gmail.com>: >> This is to be expected; if you found it surprising you need to read >> the -asclogit- manual entry more carefully. Whether it's correct or >> not really depends on what you are trying to do. I would suggest that >> including socio-demographics in your model only makes sense if you >> interact them with the alternative-specific attributes, since your >> alternatives are unlabelled. >> >> Arne >> >> On 26 November 2012 10:43, elisabetta capobianco >> <elisabetta.capobianco@gmail.com> wrote: >>> Ok Arne, >>> now It's clear and I have had good results. >>> Just a doubt. When I put inside the socio-demographic variables, the >>> output has the four alternatives 1,2,3,4, even if I write nocons. >>> I don't understand the meaning of this output considering that I have >>> unlabelled alternatives. >>> Is however correct this result? >>> >>> Thank you, >>> Elisabetta >>> >>> >>> >>> >>> >>> 2012/11/24 Arne Risa Hole <arnehole@gmail.com>: >>>> 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/ >>> >>> >>> >>> -- >>> 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/

**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>

**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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