Format
A data frame with 69 observations on the following 3 variables.
gender- a factor with levels
male female sbp- systolic blood pressure in mmHg
age- age in years
Source
D. G. Kleinbaum, L. L. Kupper, K. E. Muller, A. Nizam, A. (1998),
Applied Regression Analysis and Other Multivariable Methods,
Duxbury Press, North Scituate, MA.