[R-SIG-Finance] Return.portfolio issue

[Ilya Kipnis]

Correct.

On Mon, May 29, 2017 at 10:50 AM, ROUX, Nicolas <nicolas.roux at hec.edu>
wrote:

> Hi,
>
> So if all the assets are shorted in one period and sum of the weights
> equals -1 (as was the case in my example but hidden columns), the dummy
> variable's weight is 2?
>
> Thanks,
>
> Nicolas
>
> On 29 May 2017 16:10, "Ilya Kipnis" <ilya.kipnis at gmail.com> wrote:
>
> Weights need to sum to 1 at every period. Create a dummy asset with return
> of 0 and assign it a weight of 1 - rowSum(weights) and things will work.
>
> On Mon, May 29, 2017 at 5:49 AM, Brian G. Peterson <brian at braverock.com>
> wrote:
>
> > On 05/29/2017 02:32 AM, ROUX, Nicolas wrote:
> >
> >> Hello all,
> >>
> >> I am trying to backtest  a long/short portfolio using Return.Portfolio
> >> but am running into some sort of error, or I do not fully understand how
> >> to use return.portfolio.
> >>
> >> For a quarterly rebalancing of shorts, I am providing monthly returns, a
> >> set of negative
> >> weights in an xts format on quarter dates (created by to.period), the
> >> final argument is rebalance_on="quarters".
> >>
> >> The result is an set of regular zigzags where the position changes too
> >> regularly. Inline images 2
> >> The code:
> >>
> > <...>
> >
> > This isn't exactly a reproducible example.
> >
> > Here is a reproducible example:
> >
> > require(PerformanceAnalytics)
> > data(edhec)
> > data(weights)
> > sweights <- -1 * weights
> > pr <- Return.rebalancing(R=edhec, weights=sweights)
> > charts.PerformanceSummary(pr)
> >
> > It is clearly a bug.  We'll take a look.
> >
> > **
> >>
> >> I am not sure I understand how the short weights work? Perhaps I should
> >> just use positive weights and minus the returns afterwards?
> >>
> >> Any help much appreciated.
> >>
> >> Nicolas Roux
> >>
> >
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