DATA MINING
Desktop Survival Guide by Graham Williams |
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Mathematics |
# Posted by Thomas Lumley 20 Aug 2005 pdf("graphics/rplot-labels.pdf") x<-seq(-10,10,length=400) y1<-dnorm(x) y2<-dnorm(x,m=3) par(mar=c(5,4,2,1)) plot(x, y2, xlim=c(-3,8), type="n", xlab=quote(Z==frac(mu[1]-mu[2], sigma/sqrt(n))), ylab="Density") polygon(c(1.96,1.96,x[240:400],10), c(0,dnorm(1.96,m=3),y2[240:400],0), col="grey80", lty=0) lines(x, y2) lines(x, y1) polygon(c(-1.96,-1.96,x[161:1],-10), c(0,dnorm(-1.96,m=0), y1[161:1],0), col="grey30", lty=0) polygon(c(1.96, 1.96, x[240:400], 10), c(0,dnorm(1.96,m=0), y1[240:400],0), col="grey30") legend(4.2, .4, fill=c("grey80","grey30"), legend=expression(P(abs(Z)>1.96, H[1])==0.85, P(abs(Z)>1.96,H[0])==0.05), bty="n") text(0, .2, quote(H[0]:~~mu[1]==mu[2])) text(3, .2, quote(H[1]:~~mu[1]==mu[2]+delta)) dev.off() |