PimaIndiansDiabetes {mlbench}R Documentation

Pima Indians Diabetes Database


A data frame with 768 observations on 9 variables.


data("PimaIndiansDiabetes", package = "mlbench")
data("PimaIndiansDiabetes2", package = "mlbench")


pregnant Number of times pregnant
glucose Plasma glucose concentration (glucose tolerance test)
pressure Diastolic blood pressure (mm Hg)
triceps Triceps skin fold thickness (mm)
insulin 2-Hour serum insulin (mu U/ml)
mass Body mass index
pedigree Diabetes pedigree function
age Age (years)
diabetes Class variable (test for diabetes)


The data set PimaIndiansDiabetes2 contains a corrected version of the original data set. While the UCI repository index claims that there are no missing values, closer inspection of the data shows several physical impossibilities, e.g., blood pressure or body mass index of 0. In PimaIndiansDiabetes2, all zero values of glucose, pressure, triceps, insulin and mass have been set to NA, see also Wahba et al (1995) and Ripley (1996).


These data have been taken from the UCI Repository Of Machine Learning Databases (Blake & Merz 1998) and were converted to R format by Friedrich Leisch in the late 1990s.

The data no longer seems to be available from the UC Irvine Machine Learning Repository (now at https://archive.ics.uci.edu/).


Blake, C.L. & Merz, C.J. (1998). UCI Repository of Machine Learning Databases. Irvine, CA: University of California, Irvine, Department of Information and Computer Science. Formerly available from ‘⁠http://www.ics.uci.edu/~mlearn/MLRepository.html⁠’.

Brian D. Ripley (1996), Pattern Recognition and Neural Networks, Cambridge University Press, Cambridge.

Grace Whaba, Chong Gu, Yuedong Wang, and Richard Chappell (1995), Soft Classification a.k.a. Risk Estimation via Penalized Log Likelihood and Smoothing Spline Analysis of Variance, in D. H. Wolpert (1995), The Mathematics of Generalization, 331-359, Addison-Wesley, Reading, MA.


data("PimaIndiansDiabetes", package = "mlbench")

data("PimaIndiansDiabetes2", package = "mlbench")

[Package mlbench version 2.1-5 Index]