x <- runif(100) y <- rnorm(100)+5*xmodel <- lm(y~x)
> attributes(model)
$names
[1] "coefficients" "residuals" "effects"
[4] "rank" "fitted.values" "assign"
[7] "qr" "df.residual" "xlevels"
[10] "call" "terms" "model"
$class
[1] "lm"
请问,我想知道xlevels具体的含义,在哪里查找?


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