[R] QUERY: correlation between two time series

[Ben Bolker]

Stefano Sofia <stefano.sofia <at> regione.marche.it> writes:

> 
> I am writing on the behalf of a colleague. 
> 
> She needs to evaluate the correlation between two time series. 
> How can this be performed through R? (how many types of correlations can be
performed and which are the
> commands to do it?)
> 

  This question is too broad, and the first answer is
the usual "please read the
posting guide/documentation/etc." -- as a start, try 

?cor
help.search("correlation")
help.search("time series")

RSiteSearch( etc. )

  taking a wild guess at your friend's statistical issue,
she might needs to estimate cross-correlations between
the series in the presence of autocorrelation in each time
series, which is typically done using a multiple ARMA
model:

http://finzi.psych.upenn.edu/R/Rhelp02a.new/archive/24612.html

suggests that the dse bundle has such capabilities.

  This list is *not* a general-purpose statistics query list, but
if your friend (or you) submitted a much more careful description
of the problem, and showed more evidence of (1) having a good idea
of the general statistical background of the problem (e.g. "I think
model X would be appropriate based on reading the literature in
my area but I can't figure out whether R can do it" or 
"everyone in my field uses model X but it's not appropriate
in this case because ...") and (2) having tried to use the existing
R documentation (RSiteSearch, etc.) to find the answers to your
questions --- then you'd be much more likely to get a useful
response, even if it was not strictly an R question.

  Ben Bolker