[R] variance of combinations of means - off topic

[Liaw, Andy]

What I have in mind is the discussion on pp. 167-172 of `S Programming'.

Cheers,
Andy

> From: Spencer Graves
> 
> Hi, Andy: 
> 
>       MASS4 has section 5.7 "Bootstrap and Permutation Methods".  Is 
> this what you are suggesting?  It certainly is relevant to 
> the question 
> (but not to the "delta method", except as a means of checking on it). 
> 
>       Thanks,
>       spencer graves
> 
> Liaw, Andy wrote:
> 
> >You could try googling for "delta method".  I believe MASS 
> even has code for
> >that...
> >
> >Andy
> >
> >  
> >
> >>From: Bill Shipley
> >>
> >>Hello, and please excuse this off-topic question, but I 
> have not been
> >>able to find an answer elsewhere.  Consider a value Z that is 
> >>calculated
> >>using the product (or ratio) of two means X_mean and Y_mean:
> >>Z=X_mean*Y_mean.  More generally, Z=f(X_mean, Y_mean).  The standard
> >>error of Z will be a function of the standard errors of the 
> means of X
> >>and Y.  I want to calculate this se of Z.  Can someone 
> direct me to a
> >>reference (text book or other) that gives the solution to 
> >>this *general*
> >>problem?
> >>
> >>Thanks.
> >>
> >> 
> >>
> >>Bill Shipley
> >>
> >> 
> >>
> >>
> >>	[[alternative HTML version deleted]]
> >>
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> >>
> >
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