Search found 6 matches

by apk0022
Fri Apr 11, 2025 11:29 am
Forum: General questions about choice experiments
Topic: Dummy or effects coding
Replies: 10
Views: 168275

Re: Dummy or effects coding

Thank you for the response, Michiel.
That helped a little. I did understand the case for the estimate.
However, I am still confused about the t-ratios (significance) of the sigma values (in mixed logit) being behaviorally different for my output for different coding types.

Regards,
Asmita
by apk0022
Fri Apr 04, 2025 8:14 am
Forum: General questions about choice experiments
Topic: Dummy or effects coding
Replies: 10
Views: 168275

Re: Dummy or effects coding

Hi,
I have a follow-up question here.
I ran a mixed logit model in Apollo (R) using seed in the control. The result for the significance of heterogeneity (sd) for one attribute (with 3 levels) is not consistent across dummy and effect coding. It shows significant heterogeneity for the dummy and not ...
by apk0022
Thu Oct 31, 2024 6:12 am
Forum: General questions about choice experiments
Topic: MNL analysis does not show SE and p-value
Replies: 2
Views: 63291

Re: MNL analysis does not show SE and p-value

Thank you so much for your response.
I missed to specify the reference level for the constant it seems.
I got the values after I fixed that.

Asmita
by apk0022
Thu Oct 31, 2024 5:05 am
Forum: Support for Ngene Desktop (v1.x)
Topic: Sign of prior from pilot and assumption not matcing
Replies: 2
Views: 21005

Re: Sign of prior from pilot and assumption not matcing

Also, additional information for the above situation, the estimate of the attribute 'prediction' is not statistically significant but for 'invasiveness', it is statistically significant. However, the direction of the priors for both of them is not what we expected it to be.
by apk0022
Thu Oct 31, 2024 3:20 am
Forum: Support for Ngene Desktop (v1.x)
Topic: Sign of prior from pilot and assumption not matcing
Replies: 2
Views: 21005

Sign of prior from pilot and assumption not matcing

Hi,
I conducted the pilot study with 30 participants. I also conducted MNL to obtain the estimates and their standard errors.
However, the signs of 2 of the attributes are not in the direction we assumed. Those attributes are:
1. Prediction of clinical outcomes for a diagnostic test- we got a ...
by apk0022
Thu Oct 24, 2024 2:26 am
Forum: General questions about choice experiments
Topic: MNL analysis does not show SE and p-value
Replies: 2
Views: 63291

MNL analysis does not show SE and p-value

Hi,
I am very new to DCE study.
I launched the pilot study and tried to analyze the pilot data using MNL in R to get the priors.
I got the estimates' values but did not get the SE and p-values to determine the significance of the coefficients.

Here is what the console says about optimization ...