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From |
Patty_FARE_Guelph Apichaya <pattria_ft@hotmail.com> |

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

Subject |
RE: st: calculate probability for clogit |

Date |
Fri, 23 Apr 2010 01:34:08 +0000 |

Hi, I try to use -asclogit- but it has to have more than 2 alternatives in 1 choice set, so I cannot use this command in my analysis. For the choice design, I use SAS software to design the pair of alternative and combination of factors in order to balance and give the optimal sets. I use clogit to analyze my choices and I want to know how I calculate probability the people choose each alternative in choice set. if I want to calculate personal factors, should I use -xtlogit- or which command it is appropriate? Thanks Apichaya Lilavanichakul MSc. Candidate Department of Food Agricultural and Resource Economics Ontario Agricultural College University of Guelph Guelph, ON > Date: Tue, 20 Apr 2010 16:12:44 -0400 > Subject: Re: st: calculate probability for clogit > From: sjsamuels@gmail.com > To: statalist@hsphsun2.harvard.edu > > 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/ _________________________________________________________________ The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5 * * 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:*Steve Samuels <sjsamuels@gmail.com>

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

**Re: st: calculate probability for clogit***From:*Steve Samuels <sjsamuels@gmail.com>

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