[R] R-help Time Series

[Prof Brian Ripley]

I think

1) You have the units wrong: these appear to be the figures quoted for KB 
of compressed files, and the compression is nothing like 1024:1.

2) This is not `a series' unless you add a time base, e.g. via a call 
to ts().

Surely subscribers are aware that they do not get many MB/day and that 
extrapolation to that level is just speculation.

On Sat, 26 Feb 2005 Ted.Harding at nessie.mcc.ac.uk wrote:

> Hi Folks,
>
> While I was browsing in the R-help archives yesterday,
> I got curious about the time series of the sizes of
> the monthly archives in MB.
>
> This turned out to have an unexpected feature or two,
> which I leave to readers to explore for themselves.
>
> I'm now wondering at what point in time we might expect
> to be receiving 1000MB/month (30+MB/day). It's not that
> far away, it seems, but there are a couple of interesting
> modelling questions behind it.
>
> In particular, I wonder by what mechanism the numbers
> grow, according to the law which the data seem to indicate.
>
> Over to you.
>
> (just my 0.001 MB worth ... excluding headers)
>
> Ted
>
> To save you the trouble, the following sets up the series:
>
> MB<-c(55,19,19,18,19,17,35,27,47,
> 55,32,50,55,41,49,50,28,53,42,81,54,
> 99,60,84,80,76,75,78,61,83,97,141,122,
> 96,144,173,153,226,202,131,165,183,175,168,187,
> 240,272,262,195,236,244,285,249,326,345,392,268,
> 455,320,418,453,468,422,447,400,323,516,478,327,
> 450,487,535,658,573,606,659,543,655,722,677,567,
> 519,703,886,793,719,816,812,730,698,831,969,736,
> 855)
>
> April 1997 -- January 2005
>
> --------------------------------------------------------------------
> E-Mail: (Ted Harding) <Ted.Harding at nessie.mcc.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 26-Feb-05                                       Time: 10:31:05
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595