Important: Read this before posting to this forum

  1. 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.
  2. 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
  3. Before asking a question on the forum, users are kindly requested to follow these steps:
    1. Check that the same issue has not already been addressed in the forum - there is a search tool.
    2. 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
    3. Check the frequently asked questions section on the Apollo website, which discusses some common issues/failures. Please see http://www.apollochoicemodelling.com/faq.html
    4. Make sure that R is using the latest official release of Apollo.
  4. If the above steps do not resolve the issue, then users should follow these steps when posting a question:
    1. provide full details on the issue, including the entire code and output, including any error messages
    2. 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 4 matches

by DrWho
04 Jun 2024, 14:16
Forum: Post-estimation analysis/use of results
Topic: Limitations of market share forecasts with SP data
Replies: 5
Views: 63400

Re: Limitations of market share forecasts with SP data

Thanks a lot for your response, despite going beyond the core of Apollo.

Unfortunately, I only have SP data. I will be able to collect some RP on the subscription products, but I will only observe absolute purchase numbers for the different products (and no active opt-out) at one specific price ...
by DrWho
01 Jun 2024, 15:44
Forum: Post-estimation analysis/use of results
Topic: Limitations of market share forecasts with SP data
Replies: 5
Views: 63400

Limitations of market share forecasts with SP data

Hi Stephane and Team,

I have estimated a model for new subscription products (including an opt-out) using a Stated Preference Survey.
I would now like to estimate potential market shares for different price scenarios. For this purpose, I have opted for an disaggregate approach by generating a ...
by DrWho
21 May 2024, 08:26
Forum: Models and estimation
Topic: Use indirectly related RP data in SP model
Replies: 3
Views: 77822

Re: Use indirectly related RP data in SP model

Dear Stephane

Thanks a lot for your response.

The method for the cash/voucher I described was only used in this way to find the "jumping point". So the result is a value like $10 or $15 at which cash is preferred. I could have just asked to enter this value, but then the decision might have been ...
by DrWho
20 Mar 2024, 15:50
Forum: Models and estimation
Topic: Use indirectly related RP data in SP model
Replies: 3
Views: 77822

Use indirectly related RP data in SP model

Dear Prof. Hess and Team,

I have conducted a Stated Choice Experiment for the willigness-to-subscribe / willigness-to-pay for a subscription service.
The choice was between 3 plans with different characteristics and prices or the opt-out option.
I have estimated a nested-logit model showing a way ...