Also if you are looking for a provider of historical futures data with an 
excellent tool for creating every imaginable type of modified or 
back-adjusted futures, I would highly recommend CSI, www.csidata.com   It 
is very inexpensive and some of the best data quality I have seen.

And of course there is an R package to access the API:

http://www.itbizvision.com/ion/tiki-index.php?page=RCSI&PHPSESSID=846f6b0e30deb116c1061f7d46c90b9f





"Brian G. Peterson" <brian@braverock.com> 
Sent by: r-sig-finance-bounces@stat.math.ethz.ch
11/12/08 12:48 PM

To
"Jorge Nieves" <jorge.nieves@moorecap.com>
cc
r-sig-finance@stat.math.ethz.ch
Subject
Re: [R-SIG-Finance] Generic versus calendar futures in trading models





Jorge Nieves wrote:
> I am testing an econometric model for trading futures on commodities. I
> am setting up the back-testing phase, but I am facing a  dilemma about
> what is the best way to "easy" the transition for when futures mature
> into the next open contact. For now I am testing the model using the
> generic CL1 crude front contact. I would like to ensure that the rolling
> after maturity of each calendar contract does not generate false
> signals. Any one has any suggestion about what will be the best approach
> and why?

My first question is: How are you constructing your continuous series? 
There are many methods for constructing a continuous series for futures
and options, and the all have different problems.

Also, I think that one of the challenges in creating a backtesting
infrastructure for this type of instrument is that you can test a model
against a continuous series, but you will eventually want to hest against
historical quote and trade data on real insturments (e.g. tick data from
the exchange).  This raises your complexity immensely, for obvious
reasons.

Regards,

  - Brian

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