Subject: Re: tseries
From: Adrian Trapletti (Adrian.Trapletti@wu-wien.ac.at)
Date: Fri 16 Jul 1999 - 01:19:22 EST
Martyn Plummer wrote:
> Dear Adrian,
> Thank you for providing your time series library for R. I have been
> working on a time series package myself, with help from Paul Gilbert. It
> is called "bats" (doesn't stand for anything except possibly "basic time
> series") and can be found in the devel directory on CRAN.
> The "bats" library was a collection of S-PLUS compatibile functions
> that I needed for my "coda" package. With a little encouragement from
> Paul, I split these off into a separate package and developed them into
> more-or-less full clones of the S-PLUS functions. There are a couple of
> functions yet unwritten (autoregressive estimation via Burg's algorithm
> and spectral density estimation from fitting ar models) and this is the
> only reason why the package is in the "devel" directory.
> I am writing to ask if you would like to merge the two libraries
> together. The primary design goal of bats is compatibility with S-PLUS,
Even if I would like to, it would not be easy for me because I don't have
access to any S-PLUS.
To the R developpers: Is that a primary design goal?
> which may not be what you want. In any case, both libraries are GPL so
> you are free to use any of the code. Please have a look at bats and
> tell me what you think.
I compared the acf functions of both "bats" and "tseries":
 15.70 0.02 31.00 0.00 0.00
 0.29 0.00 1.00 0.00 0.00
I think, to achieve a better performance you should avoid loops of the
order of the length of a usual data set. It makes your routines very slow.
Though I think we should here some opinions about the design of a time
series library and then we can discuss about merging any parts or splitting
some programming work for THE R time series library.
-- Adrian Trapletti, Vienna University of Economics and Business Administration, Augasse 2-6, A-1090 Vienna, Austria Phone: ++43 1 31336 4561, Fax: ++43 1 31336 708, Email: email@example.com
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