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From |
Steve Samuels <sjsamuels@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: calculate probability for clogit |

Date |
Tue, 20 Apr 2010 16:12:44 -0400 |

I know almost nothing about discrete choice experiments, so please read the following comments with that in mind. 1. -asclogit- might be a better choice than -clogit-, as it will more easily include person-level variables like gender, income, and sex. 2. Your setup does not identify the individual in any way. The examples for -asclogit- and -clogit- all use the individual as the case or group variable. As "set" has only four levels, perhaps you can include it as a person-level variable. 3. The examples in -asclogit- consider alternatives based on one attribute (factor). You have three factors and these generate 12 (= 3 x 2 x 2) possible options, with 66 possible pairwise comparisons. You selected 32 of these, divided into four sets. I'm curious--is there a reference for this experimental design? Is the choice of comparisons and construction of the sets optimal or balanced in some sense? 4. For predicted probabilities, use the -pr- option in -asclogit- . Steve On Tue, Apr 20, 2010 at 9:39 AM, Patty_FARE_Guelph Apichaya <pattria_ft@hotmail.com> wrote: > Hi all, > > I use STATA to analyze discrete choihce experiment. My choice design has 32 choice sets with each 2 options (A and B). Each option include 3 factors: price (13,15,17), brand (AA,BB), labeling (animal,plant). The choice set will look like this. > Option A OptionB > price 13 15 > brand AA BB > labeling animal plant > > From 32 choice sets is divide into 4 block with each 8 choice sets. Each individual (100 individuals) get 1 block (8 choice sets) and ask to choose between option A or B. > > choice = 1 chosen option, 0 not chosen option > set = same for two alternatives for each set i.e. there are 32 choice sets, it is repeated number from 1 to 32 and start it > again for the next 32 choice sets. > > This is the code; clogit choice price brand labeling, group(set) > > I also want to include individual characteristics; gender, income, age. how I can do it? > > How I can calculate the probability from people choosing choice? > > Any suggestion would be great. > Pat > > > _________________________________________________________________ > Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox. > http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_1 > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Steven Samuels sjsamuels@gmail.com 18 Cantine's Island Saugerties NY 12477 USA Voice: 845-246-0774 Fax: 206-202-4783 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: calculate probability for clogit***From:*Patty_FARE_Guelph Apichaya <pattria_ft@hotmail.com>

**References**:**st: calculate probability for clogit***From:*Patty_FARE_Guelph Apichaya <pattria_ft@hotmail.com>

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