INS and diabetes mellitus: In addition to the outcome variable, the data set contains 8 quantitative covariates: pregnant (number of pregnancies), glucose (plasma glucose concentration (measured by a glucose tolerance test)), pressure (diastolic blood pressure [mmHg]), triceps (triceps skin fold thickness [mm]), insulin (2-hour serum insulin [mu U/mL]), mass (body mass index), pedigree (diabetes pedigree function), and age (age in years).