ApolloChoiceModelling forum

Hi Stephane,
I felt a little lost with this one.

Could you kindly guide me with sample code to go with the approach you suggested?
I could not figure out how to proceed exactly. It would be a great help in understanding this.

Thank you in advance.

Regards,
Asmita

Hi David,
Thank you for your response.

Here is the code for effect and dummy coding for MNL and mixed logit:
# ################################################################# #
#### DUMMYYYY - MNL ####
# ################################################################# #
### Clear memory
rm ...

Hi apollo team,
I have a couple of questions.

1. I ran a mixed logit model in Apollo (R) using seed in the control. The result for the significance of heterogeneity (nature of t-ratio for sd or sigma) for one attribute (with 3 levels) is not consistent across dummy and effect coding. It shows ...

Hi Stephane,
Thank you for your response.

I have cost following negative log-normal distribution and other attributes with normal distribution in mixed logit model in preference space. All the parameters were considered random. I used 'unconditionals' function post mixed logit model estimation to ...

Hi, a follow-up question here.
How do we get the CI for the WTP and the t-ratio (or p-value, for the significance of the WTP estimates from using unconditionals)?
Could you please provide details about it?

Regards,
Asmita

How do we obtain the confidence interval for WTP estimates of the Mixed logit model?

Sure.
Here are the code and output from the MNL model:
Code:
### Clear memory
rm(list = ls())
install.packages("apollo")
### Load Apollo library
library(apollo)

### Initialise code
apollo_initialise()

### Set core controls
apollo_control = list(
modelName = "DCE3",
modelDescr = "MNL model ...

Hi,
Please find the output below for MMNL and kindly help me understand and resolve the issue:
Model name : MMNL_DCE3_uncorrelated
Model description : Mixed logit model on DCE3 data, uncorrelated
Model run at : 2024-12-19 17:03:34.606872
Estimation method : bgw
Model diagnosis : Relative function ...

Hi Stephane,
Thank you for your response.
The AIC for MNL is 2332.18 and Mixed logit is 2253.44.

Could you advise me on the starting values if I choose to go with positive or negative lognormal
for the parameters based on the signs from MNL model? Is the way I have coded for the different levels ...

Hi Apollo team,
I ran mixed logit model without covariates for my DCE study with dummy coding.
The estimates in my result are showing undesired directions (for almost all the attributes or some level of the attributes). The directions were fine for all the attributes besides one level of fasting ...