(This article was first published on

**Timely Portfolio**, and kindly contributed to R-bloggers)I have noticed that the Russell 2000 (RUT) acts very differently from most of the other indexes that I have studied. If we apply the system shown in Shorting Mebane Faber to RUT and then extend it with a simple slope, we notice something very different about RUT behavior. No clear dominant strategy really emerges.

From TimelyPortfolio |

From TimelyPortfolio |

require(quantmod)

require(PerformanceAnalytics) getSymbols("^RUT",from="1919-01-01",to=Sys.Date()) RUT <- to.monthly(RUT)[,4]

index(RUT) <- as.Date(index(RUT)) #get 10 month rolling average

avg10 <- runMean(RUT,n=10) #know I can do this better in R but here is my ugly code

#to calculate 6 month slope of 10 month average

width=6

for (i in 1:(NROW(avg10)-width)) {

#get sp500/crb slope

model <- lm(RUT[i:(i+width),1]~index(RUT[i:(i+width)]))

ifelse(i==1,avg10slope <- model$coefficients[2],

avg10slope <- rbind(avg10slope,model$coefficients[2]))

}

#get xts so we can use

avg10slope <- xts(cbind(avg10slope),order.by=index(avg10)[(width+1):NROW(avg10)]) priceSignals <- na.omit(merge(RUT,avg10,avg10slope)) signalUpUp <- ifelse(priceSignals[,1] > priceSignals[,2] & priceSignals[,3] > 0, 1, 0)

signalUpDown <- ifelse(priceSignals[,1] > priceSignals[,2] & priceSignals[,3] < 0, 1, 0)

signalDownUp <- ifelse(priceSignals[,1] < priceSignals[,2] & priceSignals[,3] > 0, 1, 0)

signalDownDown <- ifelse(priceSignals[,1] < priceSignals[,2] & priceSignals[,3] < 0, 1, 0) retUpUp <- lag(signalUpUp,k=1)* ROC(RUT,type="discrete",n=1)

retUpDown <- lag(signalUpDown,k=1)* ROC(RUT,type="discrete",n=1)

retDownUp <- lag(signalDownUp, k=1) * ROC(RUT,type="discrete",n=1)

retDownDown <- lag(signalDownDown, k=1) * ROC(RUT,type="discrete",n=1) ret <- merge(retUpUp,retUpDown,retDownUp,retDownDown,ROC(RUT,type="discrete",n=1))

colnames(ret) <- c("UpUp","UpDown","DownUp","DownDown","RUT") jpeg(filename="performance summary.jpg",quality=100,

width=6.25, height = 6.25, units="in",res=96)

charts.PerformanceSummary(ret,ylog=TRUE,

colorset=c("cadetblue","darkolivegreen3","goldenrod","purple","gray70","black"),

main="RUT 10 Month Moving Average Strategy Comparisons

May 1987-Jun 2011")

dev.off() jpeg(filename="rolling returns.jpg",quality=100,

width=6.25, height = 6.25, units="in",res=96)

chart.RollingPerformance(ret,width=36,

colorset=c("cadetblue","darkolivegreen3","goldenrod","purple","gray70","black"),

main="RUT 10 Month Moving Average Strategy Comparisons

36 Month Rolling Return May 1987-Jun 2011")

dev.off()

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