Calculate Variance-Covariance Matrix for a Fitted Model Object
Usage
vcov(x, ...)
Arguments
x
a fitted model object.
...
additional arguments for method functions.
Description
Returns the variance-covariance matrix.
This is a generic function.
Functions with names beginning in vcov. will be
methods for this function.
lm, glm, nls.
Value
a matrix of the estimated covariances between the parameter estimates
in the linear or non-linear predictor of the model.