[R] variance of combinations of means - off topic

[Spencer Graves]

      I know two standard ways to approach this.  The traditional 
approximation is called the "delta method";  it uses a Taylor series 
approximation, usually of first order but could be higher.  Googling for 
"delta method" produced several useful hits just now.  The second method 
is Monte Carlo. 

      hope this helps.  spencer graves

Bill Shipley wrote:

>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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