[R] variance of combinations of means - off topic

[Liaw, Andy]

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
> 
>  
> 
> 
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> 
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