Description Usage Arguments Author(s) References See Also Examples
Calcluates and plots log-liklihoods lambda for power transformation of response variable. Reports chi-square test of lambda <> 1. All values of Y must > 0 or function will crash. Add offset to Y if necessary (see example). Default lambda range is -2 to 2. Uses boxCox() from car package.
1 | modelBoxCox(Model, Lambdas = seq(-2, 2, by = 0.1))
|
Model |
an unweighted linear model, produced by |
Lambdas |
a vector of lambda values to plot. Default is seq(-2,2,by=0.1) |
John J. Curtin jjcurtin@wisc.edu
Box, G. E. P. & Cox, D. R. (1964). An analysis of transformations (with discussion). Journal of the Royal Statistical Society, 26, 211-252.
boxCox(), boxcox()
1 2 3 | ##Not run
##m = lm(FPS + 99 ~ BAC+TA, data=BAC)
##modelBoxCox(m)
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