summary.rlm {MASS}  R Documentation 
summary
method for objects of class "rlm"
## S3 method for class 'rlm': summary(object, method = c("XtX", "XtWX"), correlation = TRUE, ...)
object 
the fitted model.
This is assumed to be the result of some fit that produces
an object inheriting from the class rlm , in the sense that
the components returned by the rlm function will be available.

method 
Should the weighted (by the IWLS weights) or unweighted crossproducts matrix be used? 
correlation 
logical. Should correlations be computed (and printed)? 
... 
arguments passed to or from other methods. 
This function is a method for the generic function
summary()
for class "rlm"
.
It can be invoked by calling summary(x)
for an
object x
of the appropriate class, or directly by
calling summary.rlm(x)
regardless of the
class of the object.
If printing takes place, only a null value is returned.
Otherwise, a list is returned with the following components.
Printing always takes place if this function is invoked automatically
as a method for the summary
function.
correlation 
The computed correlation coefficient matrix for the coefficients in the model. 
cov.unscaled 
The unscaled covariance matrix; i.e, a matrix such that multiplying it by an estimate of the error variance produces an estimated covariance matrix for the coefficients. 
sigma 
The scale estimate. 
stddev 
A scale estimate used for the standard errors. 
df 
The number of degrees of freedom for the model and for residuals. 
coefficients 
A matrix with three columns, containing the coefficients, their standard errors and the corresponding t statistic. 
terms 
The terms object used in fitting this model. 
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.
summary(rlm(calls ~ year, data = phones, maxit = 50)) ## Not run: Call: rlm(formula = calls ~ year, data = phones, maxit = 50) Residuals: Min 1Q Median 3Q Max 18.31 5.95 1.68 26.46 173.77 Coefficients: Value Std. Error t value (Intercept) 102.622 26.553 3.86 year 2.041 0.429 4.76 Residual standard error: 9.03 on 22 degrees of freedom Correlation of Coefficients: [1] 0.994 ## End(Not run)