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April 8, 2016 02:32
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Draw a normal probability distribution
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| mean=132; sd=13 | |
| lb=105; ub=159 | |
| x <- seq(-4,4,length=100)*sd + mean | |
| hx <- dnorm(x,mean,sd) | |
| plot(x, hx, type="n", xlab="Duration (days)", ylab="", | |
| main="Duration Probability Distribution", axes=FALSE) | |
| i <- x >= lb & x <= ub | |
| lines(x, hx) | |
| polygon(c(lb,x[i],ub), c(0,hx[i],0), col="red", density=5) | |
| area <- pnorm(ub, mean, sd) - pnorm(lb, mean, sd) | |
| result <- paste("P(",lb,"< Duration <",ub,") =", | |
| signif(area, digits=3), " mean = ",mean) | |
| mtext(result,3) | |
| axis(1, at=seq(40, 180, 20), pos=0) |
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