ApolloChoiceModelling forum

Hi Luis, I am afraid that there is no straightforward way to code your model in Apollo. What you are proposing is that the nesting structure changes from one observation to the next. For example, in the first observation alternatives 1, 2, 3, 4, 5, and 6 might be branded A, B, C, D, E, and F, respec...

Hi, I cannot be sure, but it seems like the problem lies on the initial values of your gamma parameters: you are using zero for all of them. Gammas cannot be zero (the model fails then), so I recommend you use 1 as initial values for them. For example, you could make gHD_G=1, gHD_E=1, gHD_B=1, gHD_F...

Hi, Apollo does some optimisations to the user-supplied apollo_probabilities function. Sadly, this means that you cannot use the "quote" function inside the definition of utilities. And to be in the safe side, I would recommend you do not use "quote" anywhere inside apollo_probab...

Hi, Sorry for taking so long to reply. I suspect there was a problem calculating the likelihood of the equi-probable model (LL0), or the constants-only model (LLC). We will look into avoiding these issues in v0.2.9. For now, I would recommend that before you call apollo_modelOutput, you do as follow...

Hi Punya, Your code is using two class allocation functions. What I believe you want is a single allocation function, and within each class to have two choices. Below is an example that does so. The example uses the example database apollo_timeUseData, and it estimates a latent class model with two ...

Hi Shan, I can't be sure, as I can't run your model, but I have the impression that the definion of dummy variables for some seat levels was not working, as you had line feeds inside the definition of a string (a character variable). Please try using the following apollo_probabilities and see what h...

Hi Noriel. Sorry for taking so long to reply. Below is your code using the full structure you propose, including the endogenous construct idealroute which depends only on the other latent variables. Note that I increased the number of draws you were using. I set it up to a thousand, but I would more...

Hi, Please try adding these two lines before creating "change": predictions_base = predictions_base[,-(1:2)] predictions_new = predictions_new[,-(1:2)] That should remove the first two columns of the prediction, which are the individual ID and the observation number. I am guessing that you...

Hi, Sorry for the long delay in replying. We usually work on R through the RStudio IDE, so I am afraid we have no experience with Jupyter notebooks. So we very much appreciate your insight on this. Indeed it looks like apollo_initialise is the problem. We will test your proposal for a future version...

Hi, EP_no, the variable you are using as budget, is actually a column in your database (i.e. a vector), and not a scalar. So there should be no issue with that, assuming that the column actually exists in your data. Not sure what the issue is. As a first step, I would recommend updating Apollo to th...