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 190 matches
- 19 Aug 2020, 12:54
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573875
Re: estimation in WTP-space
You should call apollo_searchStart just before calling apollo_estimate, as in: apollo_beta=apollo_searchStart(apollo_beta, apollo_fixed,apollo_probabilities, apollo_inputs) model = apollo_estimate(apollo_beta, apollo_fixed, apollo_probabilities, apollo_inputs) Be aware that apollo_searchStart can ta...
- 19 Aug 2020, 12:03
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573875
Re: estimation in WTP-space
Hi, The formulation looks fine, but I would recommend using a different ASC for the base a treatment scenarios. Also, why does only one alternative have an ASC? Are the second and third alternatives unlabelled while the first one is labelled? Keep in mind that mixed logits potentially have multiple ...
- 18 Aug 2020, 18:50
- Forum: Errors during model validation and/or estimation.
- Topic: estimation in WTP-space
- Replies: 30
- Views: 1573875
Re: estimation in WTP-space
Hi, You can obtain the mean and the s.d. of your lognormal parameters using the following code snippet: deltaMethod_settings <- list(operation="lognormal", parName1="cost_B_mu", parName2="cost_B_sig") apollo_deltaMethod(model, deltaMethod_settings) deltaMethod_settings ...
- 30 Jun 2020, 16:55
- Forum: Installation and updating
- Topic: Installing when R is run from a remote desktop
- Replies: 5
- Views: 18532
Re: Installing when R is run from a remote desktop
Hi, Apollo depends on multiple other packages to work. Among them, it depends on the package 'mnormt'. So for Apollo to work, mnormt must be installed. The issue is that the package mnormt requires R version 4 or later to work, but your system only has R version 3.6. As your R version is old, mnormt...
- 30 Jun 2020, 10:24
- Forum: Installation and updating
- Topic: Installing when R is run from a remote desktop
- Replies: 5
- Views: 18532
Re: Installing when R is run from a remote desktop
Hi, I am afraid we don't have much experience with a set-up such as yours, but we'll try to help the best we can. I would recommend starting by trying to install Apollo the regular way, that is typing: install.packages("apollo") If you do that, do you get en error message? if so, what erro...
- 17 Jun 2020, 11:37
- Forum: Model estimation
- Topic: Parallel computing MXL
- Replies: 9
- Views: 29967
Re: Parallel computing MXL
Hi Sven, I did some googling, and apparently you have run into an RStudio bug, as reported in the following forum: https://github.com/rstudio/rstudio/issues/6692 I didn't go through the whole thread, but they do say not to expect a fix earlier than a few weeks from now. In the meantime, you could tr...
- 15 Jun 2020, 13:21
- Forum: Model estimation
- Topic: Parallel computing MXL
- Replies: 9
- Views: 29967
Re: Parallel computing MXL
Hi Sven, I would recommend trying to install mvtnorm again from CRAN. I know you already did that, but I just checked CRAN and now both the r-release and r-oldrel are 1.1-1. So, with a bit of luck, installing it again might help. Also, do you have full administrator rights on your computer? It has h...
- 15 May 2020, 12:43
- Forum: Examples (existing and requests for new ones)
- Topic: LC with continuous random parameters with LV
- Replies: 2
- Views: 11140
Re: LC with continuous random parameters with LV
Hi Rafael, Attached to this post is a compressed folder containing four files: ILVLC.pdf The formulation of a latent class model with two latent variables: one influencing the class allocation, and another influencing the utility functions. ILVLC.R The implementation of the same model in Apollo. ILV...
- 12 May 2020, 17:02
- Forum: Model specification
- Topic: Choice sets with large numbers of alternatives
- Replies: 8
- Views: 12391
Re: Choice sets with large numbers of alternatives
Hi Malte, In your case, I would recommend creating 100 alternatives for all individuals, and then set their availability to reflect the actual number of alternatives that each individual faces. You can use a "for" loop to avoid writing 100 utilities. Below is an example. That piece of code...
- 28 Apr 2020, 19:41
- Forum: Bug reports
- Topic: Error with Multi-threading model estimation
- Replies: 6
- Views: 19636
Re: Error with Multi-threading model estimation
Hi Richárd, Sadly, I am not familiar with the error you got. It is an error generated by the “parallel” package, and not from Apollo, so I can only guess at what the issue is. Are you running R in windows? If so, the first time you use Apollo (or any other package) with multithreading you should get...