[R-SIG-Finance] Does R have a formal test for long vs short memory process?
Brian G. Peterson
brian at braverock.com
Thu Jan 31 19:21:52 CET 2008
tom soyer wrote:
> Does anyone know if there are formal tests for long vs short memory
> processes? i.e., quantitative tests instead of visual examination of
> corellograms produced by acf.
Perhaps you could be a bit more specific about what you want?
In addition to the ACF chart, the acf calculation calculates confidence
intervals for significance. The summary() method on the results of an
acf will tell you what the values for these confidence intervals are.
There are also several other quantitative methods that have been
proposed for measuring and dealing with acf and partial acf in financial
time series. If you have one of these methods in mind, perhaps we can
see if they are either already implemented or could be implemented easily.
Regards,
- Brian
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