[R] ls.diag and lsfit very basic question

[P Ehlers]

MM wrote:
> Hello,
> 
> Is the "std.dev" component of ls.diag( lsfit(x,y) ) the sample standard
> deviation of the residuals of the fit?
> 
> I have
>   ls.diag(lsfit(xx,yy))$std.dev
> different from
>   sd(lsfit(xx,yy)$residuals)
> 
> where xx and yy are vectors of 5 elements.

Compare

     ls.diag(lsfit(xx,yy))$std.dev

with

     sd(resid(lsfit(xx,yy)))*sqrt(4/3)

and think about degrees of freedom.

Peter Ehlers

> 
> Regards,
> 
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