Re: [R] Error propagation

From: Ben Bolker <bolker_at_ufl.edu>
Date: Tue, 25 Mar 2008 13:10:09 +0000 (UTC)

Andrej-Nikolai Spiess <a.spiess <at> uke.uni-hamburg.de> writes:

>
> Dear R-helpers,
>
> I´m in the context of writing a general function for error propagation
> in R.
> There are somehow a few questions I would like to ask (discuss), as my
> statistical knowledge is somewhat restricted.
> Below is the function I wrote, the questions are marked.
> Many thanks in advance.

  Permutations: why do you want permutations and not combinations? (i.e., order is unimportant for covariances)

  Bartlett's test: seems like overkill. I would say (in the R spirit) that people should use some common sense if they are trying to use the delta method/Gaussian error propagation

   It certainly makes sense to use the covariance, if you have covariance information.

  I haven't looked at the rest of this terribly carefully -- you could look at ?deltamethod, ?deltavar in the emdbook package (available from CRAN) as a comparison ...

  cheers
    Ben Bolker



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