The response variable is level of free fatty acid in a sample of prepubescent boys. The explanatory variables are age (in months), weight (in lbs), and skin fold thickness.

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A data frame with 41 rows and 4 columns.

`age`

age in years

`weight`

weight in lbs

`skin`

skin fold thinkness

`ffa`

free fatty acid

Morrison, D.F. (1983), *Applied Linear Statistical Models*, Englewood Cliffs, NJ:Prentice Hall.

Hettmansperger, T.P. and McKean J.W. (2011), *Robust Nonparametric Statistical Methods, 2nd ed.*, New York: Chapman-Hall.

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