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From |
elisabetta capobianco <[email protected]> |

To |
[email protected] |

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

Date |
Mon, 26 Nov 2012 11:43:51 +0100 |

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 <[email protected]>: > 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 > <[email protected]> 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 <[email protected]>: >>> 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 >>> <[email protected]> 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 <[email protected]>: >>>>> -help asclogit_postestimation- >>>>> >>>>> Arne >>>>> >>>>> On 23 November 2012 11:05, elisabetta capobianco >>>>> <[email protected]> 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 <[email protected]>: >>>>>>> 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 <[email protected]>: >>>>>>>> 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 >>>>>>>> <[email protected]> wrote: >>>>>>>>> Thank you Arne, I want to use asclogit and mlogit for my choice modelling. >>>>>>>>> >>>>>>>>> >>>>>>>>> 2012/11/19 Arne Risa Hole <[email protected]>: >>>>>>>>>> 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 >>>>>>>>>>> <[email protected]> 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) <[email protected]>: >>>>>>>>>>>> > On Sun, Nov 18, 2012 at 4:11 AM, elisabetta capobianco >>>>>>>>>>>> > <[email protected]> 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/

**Follow-Ups**:**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <[email protected]>

**References**:**st: example about choice experiment datasheet***From:*elisabetta capobianco <[email protected]>

**Re: st: example about choice experiment datasheet***From:*"JVerkuilen (Gmail)" <[email protected]>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <[email protected]>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <[email protected]>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <[email protected]>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <[email protected]>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <[email protected]>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <[email protected]>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <[email protected]>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <[email protected]>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <[email protected]>

**Re: st: example about choice experiment datasheet***From:*elisabetta capobianco <[email protected]>

**Re: st: example about choice experiment datasheet***From:*Arne Risa Hole <[email protected]>

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