you can transform the variable x "down the ladder" if it is positive
skew (x^0.5,x^ -1...)and "up the ladder" if x is negative skew ( etc,
x^2 ,x^3...).
The book "An R and S-PLUS Companion To Applied Regression" has a
section to deal with the data transformation.Especiall P109 is about
transformation for normality and symmetry.
Hope this helps.
2006/4/10, Jian Zhang <jianz at clemson.edu>:> I think it is simply, but I cannot find the method to figure out
"skewness".
> Thanks!
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Deparment of Sociology
Fudan University