summary.rlm
Summary Method for Robust Linear Models
Description
summary
method for objects of class "rlm"
Usage
## S3 method for class 'rlm' summary(object, method = c("XtX", "XtWX"), correlation = FALSE, ...)
Arguments
object | the fitted model. This is assumed to be the result of some fit that produces an object inheriting from the class |
method | Should the weighted (by the IWLS weights) or unweighted cross-products matrix be used? |
correlation | logical. Should correlations be computed (and printed)? |
... | arguments passed to or from other methods. |
Details
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.
Value
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. |
References
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.
See Also
Examples
summary(rlm(calls ~ year, data = phones, maxit = 50))
Copyright (©) 1999–2012 R Foundation for Statistical Computing.
Licensed under the GNU General Public License.