[R] Using "line" (Tukey's robust line) on 3 observations?

[Tal Galili]

By accident I came across the following example:

x <- 1:3
y <- 1:3
line(x, y) # returns:

Call:
line(x, x)

Coefficients:
[1]  -2   2


While when using 1:4, it will give the more reasonable 0,1 coefficients.

I imagine this is in the way it calculate the quantiles (i.e.: a "feature").
Can someone help in explaining this?


Thanks,
Tal









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