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. This may take a day or two at busy times. There is no need to submit the post multiple times.

Search found 21 matches

by Yashin
27 Apr 2022, 11:37
Forum: Estimation results
Topic: MNL model specification & interpretation of the parameters
Replies: 3
Views: 3519

Re: MNL model specification & interpretation of the parameters

Dear Sir, I have looked at the manual, the P-value is to be printed out in the output settings of the model. however, I tried it doing so but it usually gives an error. Here is the code: model_09 = apollo_estimate(apollo_beta, apollo_fixed, apollo_probabilities, apollo_inputs) # ####################...
by Yashin
26 Apr 2022, 07:24
Forum: Estimation results
Topic: MNL model specification & interpretation of the parameters
Replies: 3
Views: 3519

MNL model specification & interpretation of the parameters

Dear Concern, Is it possible to identify which of the parameters are statistically significant for the thresholds of p-value? The estimation procedure in Apollo reports the model fit indices such as AIC, BIC, etc. Are there any other model fit indices in Apollo that can be reported, to understand th...
by Yashin
06 Apr 2022, 15:13
Forum: Model specification
Topic: HCM with Ordered Logit (more than one indicator)
Replies: 5
Views: 3242

Re: HCM with Ordered Logit (more than one indicator)

Thank you sir for your prompt reply. Yes, surely you are right I did a mistake while defining the taus and zetas which will be different for different indicators and LV. For this first LV ('Perceive'), LV_perceive will be multiplied with different 'zetas' throughout the 4 indicators. Similarly, the ...
by Yashin
06 Apr 2022, 13:54
Forum: Model specification
Topic: HCM with Ordered Logit (more than one indicator)
Replies: 5
Views: 3242

Re: HCM with Ordered Logit (more than one indicator)

Thank you Sir for the reply. If I have understood correctly, So for each of the latent variables, there would be 4-5 OL settings depending on the number of attitudinal statements asked to the respondents? For example: Showing one latent variable 'Perceive' with 4 different attitudinal statements: Sh...
by Yashin
06 Apr 2022, 01:55
Forum: Model specification
Topic: HCM with Ordered Logit (more than one indicator)
Replies: 5
Views: 3242

HCM with Ordered Logit (more than one indicator)

Dear Sir, I have 2 questions regarding the HCM with OL. For estimating HCM with OL, I have 4 attitudinal factors such as Perceive, Attitude, Subjective Norms(SN) & Environmental Concerns(EC). Each of these attitudinal factors has 4-5 different attitudinal statements (for example the Attitudinal ...
by Yashin
03 Apr 2022, 20:40
Forum: Data preparation, processing and pre-estimation analysis
Topic: Hybrid model with OL
Replies: 2
Views: 5423

Hybrid model with OL

Dear Concern, I am trying to estimate the the Hybrid model with OL, but I cam across the section of the code which I don't understand, "choiceAnalysis_settings <- list( alternatives = c(Artemis=11, Novum=12, BestValue=21, Supermarket=22, PainAway=23), avail = with(database, list(Artemis = brand...
by Yashin
15 Mar 2022, 02:53
Forum: Errors during model validation and/or estimation.
Topic: Estimation of Generic attribute design (SP survey)
Replies: 4
Views: 3530

Estimation of Generic attribute design (SP survey)

Dear Sir, I was looking for an example of the code for the estimation of the Generic attribute design for the MNL model in the Apollo website. However, I did not find any suitable leads. My question is : Is there any dataset where the MNL model is established with a Generic dataset instead of (Alter...
by Yashin
04 Mar 2022, 12:02
Forum: Examples (existing and requests for new ones)
Topic: HCM with Ordered logit & SEM (Structural equation modeling))
Replies: 1
Views: 5722

HCM with Ordered logit & SEM (Structural equation modeling))

Dear Concern, With reference to the example of the Hybrid choice model with Ordered Logit, I have two questions. 1. While choosing to do the Hybrid choice model in order to understand the respondent's latent behaviors through attitudinal questions in a SP surey, I did not understand the example of d...
by Yashin
24 Feb 2022, 18:47
Forum: Model estimation
Topic: Starting values for Parameters in Mixed Logit Model
Replies: 1
Views: 5118

Starting values for Parameters in Mixed Logit Model

Dear Concern, I have gone through the code examples in the Apollo forum. I wanted to use the mixed logit I order to capture the preference heterogeneity in the sub-population and hence I would like to use MMNL/Mixed logit model. But I have a question regarding the starting value. Citing an example f...