Search found 20 matches

by sab
Sat Feb 01, 2025 2:53 am
Forum: General questions about choice experiments
Topic: Single profile binary DCE - latent class analysis
Replies: 2
Views: 64238

Re: Single profile binary DCE - latent class analysis

Hi Michiel,

Sorry for my delayed reply. Changing to that layout solved this issue, thanks very much for your advice!
by sab
Sat Jan 18, 2025 12:59 am
Forum: General questions about choice experiments
Topic: Single profile binary DCE - latent class analysis
Replies: 2
Views: 64238

Single profile binary DCE - latent class analysis

Hi,

I have run a DCE with 12 single profile choice tasks per ppt - they answer Yes or No to each choice task. As a result I am using standard logistic regression to model my data - there's a single row for each participant and choice task, and each row contains the DCE attributes (4 effects coded ...
by sab
Wed Dec 11, 2024 8:41 pm
Forum: General questions about choice experiments
Topic: Dummy or effects coding
Replies: 10
Views: 168275

Re: Dummy or effects coding

Thanks very much!
by sab
Tue Dec 03, 2024 10:17 pm
Forum: General questions about choice experiments
Topic: Dummy or effects coding
Replies: 10
Views: 168275

Re: Dummy or effects coding

Hi there,

I have a follow up question to the above post.

I proceeded with the effects coded design and I'm analysing the data using a mixed effects logistic regression. When I test whether there is a significant difference between two levels of an effects coded variable (e.g. I am using the ...
by sab
Wed Jul 24, 2024 7:42 pm
Forum: General questions about choice experiments
Topic: Pilot data for main study design and sample size estimate
Replies: 4
Views: 80468

Re: Pilot data for main study design and sample size estimat

Thanks so much for your help with this Michiel.
by sab
Wed Jul 17, 2024 12:24 am
Forum: General questions about choice experiments
Topic: Pilot data for main study design and sample size estimate
Replies: 4
Views: 80468

Re: Pilot data for main study design and sample size estimat

Thanks very much for your help with this Michiel.

Please could I ask two further questions based on response 2?

1) I am analysing the data in Stata with the set-up being one row per choice task with a binary choice variable 0/1. I have not added a column to my data set for the constant as it ...
by sab
Tue Jul 16, 2024 7:07 pm
Forum: General questions about choice experiments
Topic: Pilot data for main study design and sample size estimate
Replies: 4
Views: 80468

Pilot data for main study design and sample size estimate

Hi there, I have conducted a pilot study to inform the use of priors for generating my main survey design and have some questions about how I take these findings forward for the main study. For context, my design is binary – each choice set involves one medical test option and participants decide ...
by sab
Wed Jun 19, 2024 2:56 am
Forum: General questions about choice experiments
Topic: Coding opt out and asc
Replies: 2
Views: 31897

Re: Coding opt out and asc

Thanks very much for your advice, Michiel.
by sab
Mon Jun 17, 2024 8:12 pm
Forum: General questions about choice experiments
Topic: Coding opt out and asc
Replies: 2
Views: 31897

Coding opt out and asc

Hi Michiel,

I recently conducted a pilot study for a DCE exploring decisions to have medical tests. My study has 5 attributes (two with 4 levels, three with 3 levels). Four of the attributes are effects coded, and the other is treated as continuous.

I generated 36 choice tasks using a d ...
by sab
Sat May 25, 2024 4:50 pm
Forum: General questions about choice experiments
Topic: Continuous variable with uneven distance between levels
Replies: 7
Views: 49363

Re: Continuous variable with uneven distance between levels

Hi Michiel,

Thank you very much for this! I should have mentioned that it’s a binary choice design - participants will see single choices and answer Yes/No. there is level balance across and largely within blocks so hopefully that will be okay in this case.

Thanks again for your advice.