Returns the residuals standard deviation (sigma) for object of class "kspm".
an object of class "kspm", usually, a result of a call to
additional optional argument (currently unused).
The value returned by the method is sqrt(RSS / edf) where RSS is the residual sum of squares and edf is the effective degree of freedom.
typically a number, the estimated standard deviation of the errors ("residual standard deviation")
Catherine Schramm, Aurelie Labbe, Celia Greenwood
kspm for fitting model, summary.kspm, residuals.kspm, nobs.kspm, deviance.kspm.
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