topic Re: Coding Scheme JMP uses for Categorical predictors in Discussions

Coding Scheme JMP uses for Categorical predictors

DendrogramSteer — Fri, 02 Jun 2023 15:09:24 GMT

Hi! Is there a way to know the default coding scheme that JMP uses for categorical predictors? I know that JMP uses -1 and 1 for a two-level factor, but I want to know how it sets for factors with multiple levels. Thanks!

Re: Coding Scheme JMP uses for Categorical predictors

Mark_Bailey — Fri, 02 Jun 2023 16:54:13 GMT

See the documentation.

Re: Coding Scheme JMP uses for Categorical predictors

SamGardner — Fri, 02 Jun 2023 18:41:20 GMT

A way to see the actual coding for design is to fit a simple main effects model to the data (use simulated/random data for a response if you don't have it), and then in Fit Least Squares, select from the red triangle > Save Columns > Save Coding Table. I have attached a table, that has an original design with a 2 level, 3 level, and 4 level categorical factor, along with the columns from the coding table joined into the design table.