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.
an unweighted linear model, produced by
a vector of lambda values to plot. Default is seq(-2,2,by=0.1)
John J. Curtin [email protected]
Box, G. E. P. & Cox, D. R. (1964). An analysis of transformations (with discussion). Journal of the Royal Statistical Society, 26, 211-252.
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##Not run ##m = lm(interlocks + 1 ~ assets+nation, data=Ornstein) ##modelBoxCox(m)
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