Thirty-nine quail were randomized to one of for treatments for lowering cholesterol.

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A data frame with 39 observations on the following 2 variables.

`treat`

a factor with levels

`1`

`2`

`3`

`4`

`ldl`

a numeric vector

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

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