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From | elisabetta capobianco <elisabetta.capobianco@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: example about choice experiment datasheet |
Date | Fri, 23 Nov 2012 14:25:03 +0100 |
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/