ApolloChoiceModelling forum

Hi Stephane, Thank you for your quick response. your second model allows for differences in cost sensitivity between men and women, so it's quite normal that you would get differences in the WTP. Does that not make sense to you? Indeed, since I allow for differences in cost, I get different values o...

Dear Stephane, I have calculated two models, model A : ten random coefficients, model B : ten random coefficients and I have allowed for differences between genders in the cost coefficient randcoeff[["b_cost"]] = -exp( mu_log_b_cost + sigma_log_b_cost * draws_cost + (gender == 1) * ( mu_ma...

Dear Stephane, One additional question related to the previous one. When I use a single random coefficient allowing for differences between men and women, there is a higher sd error for the attributes e.g. > (mean(wtp_unit)); (sd(wtp_unit)) [1] 12.42137 [1] 587.157 while when I do not allow for diff...

Dear Stephane, Thank you for your recommendation. I created a single random coefficient you suggested. randcoeff[["b_cost"]] = -exp( mu_log_b_cost + sigma_log_b_cost * draws_cost + (gender == 1) * ( mu_male_cost + sigma_male_cost * draws_male_cost)) Now, I am trying to get the full distrib...

Hi Stephane, This helped. thank you. Here is the code when I include the interactions in the random coefficient, I get NA # ################################################################# # #### LOAD LIBRARY AND DEFINE CORE SETTINGS #### # ################################# ########################...

Hi Stephane, Thank you for the suggestions. One point for the negative sign. If I do not use it, then my wtp is negative. is this correct? Regarding the cost_male I am getting something like this [1] 1.504081e+18 [1] 3.999951e+20 Does this make sense? Also, when I include the interactions in the ran...

Hello David, Hello Zhao, I am running a mixed logit model in wtp space with negative lognormal for the price, while for the rest random coefficients, I use the normal distribution. However, the starting value for price (I use the values from the mnl model) doesn't work since the model produces NA. I...

Hi Stephane, Thank you. I first calculate the unconditional and then estimate the wtp separately for each random coefficient by the cost. I also use a negative sign since I use negative lognormal distribution for the cost. is this correct? Here is the code I use. ##uncoditionals unconditionals <- ap...

Dear Stephane, Dear David, Thank you! I'm not sure if I need to create a new post or if I could ask here. sorry. I also want to run a mixed logit model for the dutch sample. The aim of my analysis is to investigate wtp for different functionalities on bicycles. I found some deterministic heterogenei...

Dear David, Thank you very much. I really appreciate your help. Indeed, I want to calculate the average posterior class allocation probability for each country and for some other sociodemographic variables. What you recommended works fine. Another question I have is about the heterogeneity. In the m...