Hello
When I create an Xbar Chart with sub groups of various sizes defined by a label, I am getting different Avg Rs for the different subgroups (see graph).
How exactly are the avg Rs (displayed in the R Chart as the Center line) for a given subgroup calculated ?
Originally I thought they were the mean of the ranges within a subgroup, but there are several occasions (in the graph below), where the Avg R is bigger than the Range within a subgroup, so there seems to be another method behind it.
The used data is a color measurement with the subgroups chosen according to the film build the color layer has. (I am working with JMP 17, but have the same question with JMP 16)
thank you and best regards