In JMP 17.0 I am unable to generate the correct denominator degrees of freedom for testing the whole-plot term, in what I think is a split-plot design. The design is as follows (a simple data file is attached):
- 44 sites (whole plots), each with two subplots
- Of the whole plots, 27 receive treatment T and 17 receive treatment UT
- Subplots are assigned treatment B or UB
I have tried structuring the model using both SLS and mixed-model personalities, following the JMP tutorials for split-plot designs. Models produce a denominator d.f. of 42 for testing the subplot and whole-plot x subplot factors (which seems appropriate). However, they produce the same d.f.s for testing the whole-plot term, which seems inflated. Advice on whether and how this can be modeled as split-plot design would be appreciated.
Data are attached.
