[R] what is scale function? Is it for variable transformation?
ggrothendieck at gmail.com
Sun Mar 5 16:19:50 CET 2006
It will change the coefficients from lm and therefore their t-values but it
will not change the residuals, fitted values, R-squared, F
statistic, etc. For example, try this:
x <- 1:10
y <- x + rnorm(10)
lm0 <- lm(y ~ x) # without scale
lms <- lm(y ~ scale(x)) # with scale
all.equal(fitted(lm0), fitted(lms)) # TRUE
# note what the is the same and what is different
Another use of scale is comparing graphs.
ts.plot(scale(USeconomic), col = 1:4)
# compare with
ts.plot(USeconomic, col = 1:4)
On 3/5/06, Kum-Hoe Hwang <phdhwang at gmail.com> wrote:
> I read R books about scale function for variable transformation.
> Acoording to this book
> scale function leads me to better regression results. Or am I worng?
> I hope somebody tell me about a scale function?
> Is it for variable transformation?
> Kum-Hoe Hwang, Phone : 82-31-250-3516Email : phdhwang at gmail.com
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