Artifical data on 20 subjects to illustrate issues of causality with observational data
A data frame with 20 observations on the following 5 variables.
a factor with levels
Index of coffee consumption
Index of stress
Heart Index: higher indicates a less healthy heart
Index of stress that is less reliable than 'Stress'
Monette, G. (1990), Geometry of Multiple Regression and Interactive 3-D Graphics, In Fox, J. & Long, S. (ed.), Modern Methods of Data Analysis, Sage Publications, 209-256.
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