Pima.tr
Pima.tr2
Pima.teRipley, B.D. (1996) Pattern Recognition and Neural Networks. Cambridge: Cambridge University Press.
Pima.tr contains a randomly selected set of 200
  subjects, and Pima.te contains the remaining 332 subjects.
  Pima.tr2 contains Pima.tr plus 100 subjects with
  missing values in the explanatory variables.