Hello,
In my dataset, I have many socioeconomic variables such as age_group, Disability, Income_group.
I have 4 mode choices including Drive, Ride, Bus, Walk.
When I put all the socioeconomic variables in each of the utility functions, it leads to over-specification of variables. What is the solution to this?
Is it correct if I put a socio-economic variable in just one or two utilities instead of all four utilities?
V[["DR"]] = asc_DR + A_Drive_Time * Drive_Time + A_Drive_Cost*Drive_Cost
V[["RI"]] = A_Ride_Time *Ride_Time
V[["WA"]] = asc_WA+ C_Walk_Time*Walk_Time +C_Age*age_group+C_Disability*Disability
V[["BUS"]]=asc_BUS+ D_Bus_Time*Bus_Time +D_Bus_Cost * Bus_Cost +
D_Income_Group*(Income_Group==0)+ +D_Age*age_group+C_Disability*Disability
Thanks!
Ariana
Important: Read this before posting to this forum
- This forum is for questions related to the use of Apollo. We will answer some general choice modelling questions too, where appropriate, and time permitting. We cannot answer questions about how to estimate choice models with other software packages.
- There is a very detailed manual for Apollo available at http://www.ApolloChoiceModelling.com/manual.html. This contains detailed descriptions of the various Apollo functions, and numerous examples are available at http://www.ApolloChoiceModelling.com/examples.html. In addition, help files are available for all functions, using e.g. ?apollo_mnl
- Before asking a question on the forum, users are kindly requested to follow these steps:
- Check that the same issue has not already been addressed in the forum - there is a search tool.
- Ensure that the correct syntax has been used. For any function, detailed instructions are available directly in Apollo, e.g. by using ?apollo_mnl for apollo_mnl
- Check the frequently asked questions section on the Apollo website, which discusses some common issues/failures. Please see http://www.apollochoicemodelling.com/faq.html
- Make sure that R is using the latest official release of Apollo.
- Users can check which version they are running by entering packageVersion("apollo").
- Then check what is the latest full release (not development version) at http://www.ApolloChoiceModelling.com/code.html.
- To update to the latest official version, just enter install.packages("apollo"). To update to a development version, download the appropriate binary file from http://www.ApolloChoiceModelling.com/code.html, and install the package from file
- If the above steps do not resolve the issue, then users should follow these steps when posting a question:
- provide full details on the issue, including the entire code and output, including any error messages
- posts will not immediately appear on the forum, but will be checked by a moderator first. This may take a day or two at busy times. There is no need to submit the post multiple times.
including socioeconomic variables in the utility functions
-
- Posts: 10
- Joined: 28 Nov 2021, 01:34
-
- Site Admin
- Posts: 1068
- Joined: 24 Apr 2020, 16:29
Re: including socioeconomic variables in the utility functions
Ariana
please remember that only differences in utility matter. So if you just interact the socio-demographics with the constants (which is what you do below), then you can only include them in J-1 alternatives. It's different of course if you interacted them with the continuous attributes
Stephane
please remember that only differences in utility matter. So if you just interact the socio-demographics with the constants (which is what you do below), then you can only include them in J-1 alternatives. It's different of course if you interacted them with the continuous attributes
Stephane
-
- Posts: 10
- Joined: 28 Nov 2021, 01:34
Re: including socioeconomic variables in the utility functions
Hi Stephane,
Thank you so much for the clarification. I really appreciate your help!
Best,
Ariana
Thank you so much for the clarification. I really appreciate your help!
Best,
Ariana