cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
JMP is taking Discovery online, April 16 and 18. Register today and join us for interactive sessions featuring popular presentation topics, networking, and discussions with the experts.
Choose Language Hide Translation Bar
Robhugh22
Level I

Not all parameters calculated in Choice Model

I have followed the help for running a choice model on the attached Profile and Choice Data. I can't understand why the Tube, Generic, and None parameters don't show in the results (see attached JPG). There are four attributes, Format (4 levels), Shape (2 levels), Colour (3 levels) and Logo (2 levels). There are three profile ID choices, and the test is weighted by 'Test Cell' which seperates 4 different groups of people.

Choice Model Cell 1.jpgChoice Model Set up.jpg

1 ACCEPTED SOLUTION

Accepted Solutions
susan_walsh1
Staff (Retired)

Re: Not all parameters calculated in Choice Model

The last level of each attribute is not shown in the parameter estimates table because it is not independent of the others. All of the parameter estimates for a particular attribute will sum to zero, so the last level will be the additive inverse of the sum of the other levels. You can choose Effect Marginals from the red triangle menu and you will see the values for all levels of each attribute.

View solution in original post

4 REPLIES 4
susan_walsh1
Staff (Retired)

Re: Not all parameters calculated in Choice Model

The last level of each attribute is not shown in the parameter estimates table because it is not independent of the others. All of the parameter estimates for a particular attribute will sum to zero, so the last level will be the additive inverse of the sum of the other levels. You can choose Effect Marginals from the red triangle menu and you will see the values for all levels of each attribute.

Robhugh22
Level I

Re: Not all parameters calculated in Choice Model

@susan_walsh1THANK YOU! I did not click enough of the buttons to see that show up in JMP and have been trying to run an analysis in R instead for weeks. I am so grateful!

Robhugh22
Level I

Re: Not all parameters calculated in Choice Model

Is it also possible to display the std error for all parameters estimates including the marginal ones?

 

Re: Not all parameters calculated in Choice Model

While I understand the degrees of freedom consideration, when running models that involve segmenting variables, it would be very handy to have the choice to see all the parameters in one place, including the ones not normally shown because they are redundant.