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.
Search found 6 matches
- 10 Dec 2023, 03:33
- Forum: Errors during model validation and/or estimation.
- Topic: Parameter b does not influence the log-likelihood of model
- Replies: 1
- Views: 1422
Parameter b does not influence the log-likelihood of model
Hi Stephane and David, After trying to run such a model I get information that the parameter b_revisit_c1 does not influence the log-likelihood of my model. Can you check, please, where the problem could be? ## scaled variables apollo_beta = c(asc_car_c1 = 0, asc_taxi_c1 = 0, asc_bus_c1 = 0, asc_met...
- 01 Nov 2023, 03:20
- Forum: Models and estimation
- Topic: WTP intervals
- Replies: 1
- Views: 4067
WTP intervals
Dear all, I want to claculate WTP 95% CI and used the function apollo_bootstrap to produce bootstrap estimates. As a result of the bootstrap estimation of the example, it gives mean parameter values and covariance matrix. What should have done after this step to get the comparable result of WTP inte...
- 31 Oct 2023, 03:00
- Forum: Model estimation
- Topic: How to calculate 95% confidence level?
- Replies: 1
- Views: 6816
How to calculate 95% confidence level?
Dear all, I ran my model (LCNL) and calculated the WTP using apollo_deltaMethod. Now I want to obtain the 95% confidence intervals for each estimated parameter and the WTP values, but I don't know how to calculate them. Could you please give me an example (code syntax)? Many thanks! Best wishes, Chu...
- 10 May 2023, 04:17
- Forum: Estimation results
- Topic: Error in LCNL model
- Replies: 3
- Views: 3085
Re: Error in LCNL model
Dear Stephane
Thanks for your reply, I have tested the NL model without the latent class structure, and the results were fine.
Chunyu Song
Thanks for your reply, I have tested the NL model without the latent class structure, and the results were fine.
Chunyu Song
- 06 May 2023, 09:43
- Forum: Estimation results
- Topic: Error in LCNL model
- Replies: 3
- Views: 3085
Error in LCNL model
Dear Apollo team, I'm estimating individuals' mode choice using LCNL (Latent Class Nested Logit) model. The model is made-up of 4 choice sets (bus, railway, highway and airline), each of which contains 4 continuous variables (cost, access time, journey time and frequency) with 3 levels and 1 dummy v...
- 15 Aug 2022, 19:00
- Forum: Estimation results
- Topic: Error in Latent Class Nested Logit Model- NAN
- Replies: 1
- Views: 4889
Error in Latent Class Nested Logit Model- NAN
Dear all, Apologies if this is in the manual, but I've been searching all day and I can't find it. I want to create a model to analyze heterogeneity between classes and substitution between choices by using latent class analysis with nested logit model. But I am having some problems running this mod...