[R-SIG-Finance] Consolidating Backtests

[Ilya Kipnis]

Set a seed.
Loop through months, using that seed to generate the integer value of your
lookback every month.
Loop through all unique integer lookback values.
Compute your indicator for those values.
Proceed as usual.

On Sun, Aug 16, 2015 at 3:02 PM, Brian G. Peterson <brian at braverock.com>
wrote:

> On Sun, 2015-08-16 at 20:19 +0300, Akane Fortuna wrote:
> > I am trying to test a strategy with random parameters that change every
> > month as some kind of a benchmark to compare my other strategies against.
> > This strategy is applied to the same instrument every month.  I tried to
> > make a loop with applystrategy(), where in each iteration the different
> > random parameter values are passed, and the next month's data is used.
> The
> > first iteration is executed without problems but I cannot make the next
> > iterations work.
> >
> > I want to be able to use chart.Posn(), tradeStats() (in consolidated
> form),
> > chart.ME(), getOrderBook(), getTxns() with the consolidated strategy
> > backtest.
> >
> > How should I go about doing this? No code is necessary for an answer,
> but I
> > appreciate it if there is. Just outline/plan of the code is sufficient.
> > Thank you.
>
> The challenge with what you're trying to do is that the indicators and
> signals are presumed to be vectorized functions.  So they are applied to
> the entire dataset at once.
>
> You're talking about subsetting the data by months, and applying
> different parameter values.
>
> If your indicators and signals don't have any lookback period, or are
> constant over the entire test, then you should be able to use a
> rebalance rule, which will subset the data and let you change things
> around on your rebalance periods.
>
> Assuming that's not the case, your options are somewhat more limited.
>
> You have no problems using the same portfolio and account over
> progressively increasing time periods.  You're basically just adding new
> transactions over time.
>
> The slightly challenging point will be in controlling the start and end
> periods for everything else.  You'll need to make sure you don't have
> signals before the start of the subset period, or after the end of the
> subset period.
>
> A minimal reproducible example would help others help you.
>
> Regards,
>
> Brian
>
>
> --
> Brian G. Peterson
> http://braverock.com/brian/
> Ph: 773-459-4973
> IM: bgpbraverock
>
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