[R] inbuilt crossover function for backtesting

[Joshua Ulrich]

On Mon, Aug 10, 2015 at 11:02 AM, boredstoog via R-help
<r-help at r-project.org> wrote:
> Thanks Joshua for the quick reply to the mail and once more sorry for
> bothering with another doubt. So i have modified your code :) for
> backtesting and this is the code
>
> *
> library(quantmod)
> library(tseries)
> require(quantstrat)
> library(PerformanceAnalytics)
> sym <- get(getSymbols('SPY'))["2013::"]
> sym$sma10 <- SMA(Cl(sym),10)
> sym$sma30 <- SMA(Cl(sym),30)
> buy <- sigCrossover("buy", SPY, c("sma10","sma30"), "gt")
> sell <- sigCrossover("sell", SPY, c("sma30","sma10"), "lt")
> if (buy==TRUE){
>     sym$pos<-1
> } else if (sell==TRUE){
>    sym$pos<--1
> }
> myReturn <- lag(sym$pos) * dailyReturn(sym)
> charts.PerformanceSummary(cbind(dailyReturn(sym),myReturn))*
>
>
> But the above code is returing this error
>
> *Error in if (buy == TRUE) { : missing value where TRUE/FALSE needed
> In addition: Warning message:
> In if (buy == TRUE) { :
>   the condition has length > 1 and only the first element will be used
>> myReturn <- lag(sym$pos) * dailyReturn(sym)
> Error in hasTsp(x) : attempt to set an attribute on NULL
>> charts.PerformanceSummary(cbind(dailyReturn(sym),myReturn))
> Warning message:
> In to_period(xx, period = on.opts[[period]], ...) :
>   missing values removed from data*
>
> Any idea what is hapennning
>
There are several errors in your code.  Rather than enumerate them and
show you how to fix each one; I suggest you simply use quantstrat as
it was intended, rather than attempt to circumvent/re-invent it.

See demo('macd') and modify the demo source code to suit your purposes.

>
>
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-- 
Joshua Ulrich  |  about.me/joshuaulrich
FOSS Trading  |  www.fosstrading.com