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. We check the forum at least twice a week. It may thus take a couple of days for your post to appear and before we reply. There is no need to submit the post multiple times.
Search found 6 matches
- 17 Jun 2021, 14:52
- Forum: Model specification
- Topic: Logistic measurment model in Hybrid choice model
- Replies: 2
- Views: 9142
Re: Logistic measurment model in Hybrid choice model
Of course! Thanks for the reply.
- 17 Jun 2021, 14:24
- Forum: Model specification
- Topic: Logistic measurment model in Hybrid choice model
- Replies: 2
- Views: 9142
Logistic measurment model in Hybrid choice model
Hello
I very much appreciate the apollo package, and not least the great support provided in this forum!
I want to estimate a Hybrid choice model where the indicators are binary. I therefore want to specify a logistic indicator function, but I struggle to adjust the code accordingly. I have been ...
I very much appreciate the apollo package, and not least the great support provided in this forum!
I want to estimate a Hybrid choice model where the indicators are binary. I therefore want to specify a logistic indicator function, but I struggle to adjust the code accordingly. I have been ...
- 01 Dec 2020, 07:40
- Forum: Post-estimation analysis/use of results
- Topic: WTP intervals
- Replies: 8
- Views: 19993
Re: WTP intervals
Dear Stephane
Thanks for sharing your working paper above. I found it very interesting and useful!
As mentioned in the paper it is common to use the method proposed by Krinsky & Robb to produce confidence intervals for WTP-estimates. It is also common to use the draws obtained with this method to ...
Thanks for sharing your working paper above. I found it very interesting and useful!
As mentioned in the paper it is common to use the method proposed by Krinsky & Robb to produce confidence intervals for WTP-estimates. It is also common to use the draws obtained with this method to ...
- 28 Apr 2020, 20:03
- Forum: Model specification
- Topic: WTW space with random coefficients
- Replies: 4
- Views: 21327
Re: wtp space
Hello
Thanks for the suggestion. After some testing with different starting values I found tha using good starting values, close to the ratio obtained in the MNL-model, solves the problem. Now I know that there is nothing wrong with the model specification, and can move forward with RPL ...
Thanks for the suggestion. After some testing with different starting values I found tha using good starting values, close to the ratio obtained in the MNL-model, solves the problem. Now I know that there is nothing wrong with the model specification, and can move forward with RPL ...
- 28 Apr 2020, 12:03
- Forum: Model specification
- Topic: WTW space with random coefficients
- Replies: 4
- Views: 21327
Re: wtp space
Dear Stephane
Thank you very much for the quick response!
Yes, true, I meant negative lognormal distribution for the cost parameter.
The following model specification and results are with the sq-parameter in wtp-space:
V = list()
V[['beef']] = b_price * ( w_beef + w_org*org1 + price1 )
V ...
Thank you very much for the quick response!
Yes, true, I meant negative lognormal distribution for the cost parameter.
The following model specification and results are with the sq-parameter in wtp-space:
V = list()
V[['beef']] = b_price * ( w_beef + w_org*org1 + price1 )
V ...
- 27 Apr 2020, 20:13
- Forum: Model specification
- Topic: WTW space with random coefficients
- Replies: 4
- Views: 21327
WTW space with random coefficients
Hello
I want to estimate an RPL model in wtp space, where all wtp-parameters should be specified to take normal distributions, and the cost-parameter to take a lognormal distribution. First, I am estimating MNL models to figure out the wtp-space specification.
This works nicely with the ...
I want to estimate an RPL model in wtp space, where all wtp-parameters should be specified to take normal distributions, and the cost-parameter to take a lognormal distribution. First, I am estimating MNL models to figure out the wtp-space specification.
This works nicely with the ...