The vaso data contains binary data.
Three test persons inhaled a certain amount of air with different rates.
In some cases a vasoconstriction (neural constriction of vasculature) occured at their skin.
The goal of the study was to indicate a correlation between breathing and vasoconstriction.
The test persons repeated the test 9, 8, 22 times. So the dataframe has 39 observations.
Finney, D. J. (1971) Probit Analysis. 3rd edition. Cambridge University Press.
Pregibon, D. (1982) Resistant fits for some commonly used logistic models. Appl. Stat. 29, 15--24.
Hastie, T. J. and Tibshirani, R. J. (1990) Generalized Additve Models. Chapman and Hall.