sorry about not following the posting guidelines, may have missed them a little.......
I use SPSS 22 on OSX10.10.4.
the data is about renal function, and classification into a CKD class by using a different formula to calculate renal function.
so there are 6 classes, and patients are assigned a specific class by result of reference technique, and a class based on outcome of formula.
the question is which formula is better at predicting the CKD class?