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Computes the unbiased estimate for the variance of the residuals of a model.
# S3 method for mlm var(x,...) # S3 method for lm var(x,...)
returns a scalar giving the estimated variance of the residuals
returns a the estimated variance covariance matrix of the residuals
a linear model object
Unused, for generic purposes only.
K.Gerald v.d. Boogaart http://www.stat.boogaart.de, Raimon Tolosana-Delgado
The difference of this command to var(resid(X)) is that this command correctly adjusts for the degrees of freedom of the model.
var(resid(X))
vcov
data(Orange) var(lm(circumference~age,data=Orange)) var(lm(cbind(circumference,age)~age,data=Orange))
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