Robust Scale Estimate

DESCRIPTION:

Returns the robust scale estimate for robust linear regression, as estimated by lmRobMM.

USAGE:

scale.lmRobMM(x, estimate="initial") 

REQUIRED ARGUMENTS:

x
an object of class "lm.RobMM".

OPTIONAL ARGUMENTS:

estimate
a character string that determines the type of the scale estimate.

VALUE:

the robust scale estimate.

DETAILS:

The default is to return the initial S-estimate of the scale. To obtain the scale estimate corresponding to the final M-estimates, set estimate to "final" .

SEE ALSO:

.

EXAMPLES:

stack.df <- data.frame(Loss=stack.loss,stack.x) 
stack.robust <- lmRobMM(Loss~Air.Flow+Water.Temp+Acid.Conc.,data=stack.df) 
scale.lmRobMM(stack.robust)