I have 15 genotypes of corn, sown in two different irrigation regimes - full and deficit with 3 replications of each irrigation regimes in split plot. I have run my data in mixed model - Irrigation regimes (fixed), Genotypes (fixed), Replications (Fixed), Irrigation Regimes x Genotypes (fixed), Irrigation Regimes x Replications (random). I need to get repeatability of all genotypes. Theory says that repeatability means how consistent any genotype performs in all replications. According to this theory, graph showing the mean of 3 replications with minimum range for a particular genotype is said to have high repeatability and the one having maximum range is said to have low repeatability. But how can i get numerical value of repeatability for each genotype using JMP?
Rahul,
You may want to use an all-random model if what you're trying to do is calculate repeatability. Also, I would probably nest replications within your irrigation regimes. That might work better, or at least it is something to try. I don't know if there's a way to calculate repeatability in JMP, but you can export the information necessary and calculate it in Excel easily.
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