PimaIndiansDiabetes {mlbench} | R Documentation

## Pima Indians Diabetes Database

### Description

A data frame with 768 observations on 9 variables.

### Usage

      data(PimaIndiansDiabetes)
      data(PimaIndiansDiabetes2)

### Format

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 (weight in kg/(height in m)\^2)
pedigree | Diabetes pedigree function
age | Age (years)
diabetes | Class variable (test for diabetes)

### Details

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).

### Source

- Original owners: National Institute of Diabetes and Digestive and Kidney Diseases

- Donor of database: Vincent Sigillito (vgs@aplcen.apl.jhu.edu)

These data have been taken from the UCI Repository Of Machine Learning Databases at

- ftp://ftp.ics.uci.edu/pub/machine-learning-databases

- http://www.ics.uci.edu/~mlearn/MLRepository.html

and were converted to R format by Friedrich Leisch.

### References

Newman, D.J. & Hettich, S. & Blake, C.L. & Merz, C.J. (1998). UCI Repository of machine learning databases [http://www.ics.uci.edu/~mlearn/MLRepository.html]. Irvine, CA: University of California, Department of Information and Computer Science.

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.

### Examples

      data(PimaIndiansDiabetes)
      summary(PimaIndiansDiabetes)

      data(PimaIndiansDiabetes2)
      summary(PimaIndiansDiabetes2)

[Package mlbench version 2.1-1 Index]