[R] variance of combinations of means - off topic

[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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