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# Modifed from pnormGC() in tigerstats package
# setting graph default value to TRUE, no area returned to console, round mean and sd
normGraph <- function(bound,region="below",mean=0,sd=1,graph=TRUE) {
if (!is.numeric(bound)) stop("Specify one or two numerical boundaries")
if (length(bound)==1 & !(region %in% c("below","above"))) stop("Specify region=\"below\" or
region=\"above\"")
if (length(bound)==2 & !(region %in% c("between","outside"))) stop("Specify region=\"between\" or
region=\"outside\"")
if (length(bound)>2) stop("Specify one or two numerical boundaries")
if (length(bound)==2 & bound[1]>bound[2]) bound <- rev(bound)
if (grepl("^be[lf]",region,perl=TRUE)) {
area <- pnorm(bound,mean=mean,sd=sd)
if (graph) {
upper <- max(qnorm(.9999,mean=mean,sd=sd),bound+0.1*sd)
lower <- min(qnorm(0.0001,mean=mean,sd=sd),bound-0.1*sd)
curve(dnorm(x,mean=mean,sd=sd),from=lower,to=upper,ylab="density",axes=FALSE,n=50,
main=paste("Normal Curve, mean = ",round(mean,2),", SD = ",round(sd,2),"\n Shaded Area = ",
round(area,4)))
UnderShade(low=lower,high=bound,func=dnorm,mean=mean,sd=sd)
axis(2)
places <- c(lower,bound,mean,upper)
axis(1,at=places,labels=c("",as.character(round(places[2:3],3)),""))
}
}
if (grepl("^a[bf]",region,perl=TRUE)) {
area <- pnorm(bound,mean=mean,sd=sd,lower.tail=FALSE)
if (graph) {
upper <- max(qnorm(.9999,mean=mean,sd=sd),bound+0.1*sd)
lower <- min(qnorm(0.0001,mean=mean,sd=sd),bound-0.1*sd)
curve(dnorm(x,mean=mean,sd=sd),from=lower,to=upper,ylab="density",axes=FALSE,n=50,
main=paste("Normal Curve, mean = ",round(mean,2),", SD = ",round(sd,2),"\n Shaded Area = ",
round(area,4)))
UnderShade(low=bound,high=upper,func=dnorm,mean=mean,sd=sd)
axis(2)
places <- c(lower,bound,mean,upper)
axis(1,at=places,labels=c("",as.character(round(places[2:3],3)),""))
}
}
if (grepl("^bet|^in",region,perl=TRUE)) {
area <- pnorm(bound[2],mean=mean,sd=sd)-pnorm(bound[1],mean=mean,sd=sd)
if (graph) {
upper <- max(qnorm(.9999,mean=mean,sd=sd),bound+0.1*sd)
lower <- min(qnorm(0.0001,mean=mean,sd=sd),bound-0.1*sd)
curve(dnorm(x,mean=mean,sd=sd),from=lower,to=upper,ylab="density",axes=FALSE,n=50,
main=paste("Normal Curve, mean = ",round(mean,2),", SD = ",round(sd,2),"\n Shaded Area = ",
round(area,4)))
UnderShade(low=bound[1],high=bound[2],func=dnorm,mean=mean,sd=sd)
axis(2)
places <- c(lower,bound[1],bound[2],upper)
axis(1,at=places,labels=c("",as.character(places[2:3]),""))
}
}
if (grepl("^out",region,perl=TRUE)) {
area <- pnorm(bound[1],mean=mean,sd=sd)+pnorm(bound[2],mean=mean,sd=sd,lower.tail=FALSE)
if (graph) {
upper <- max(qnorm(.9999,mean=mean,sd=sd),bound+0.1*sd)
lower <- min(qnorm(0.0001,mean=mean,sd=sd),bound-0.1*sd)
curve(dnorm(x,mean=mean,sd=sd),from=lower,to=upper,ylab="density",axes=FALSE,n=50,
main=paste("Normal Curve, mean = ",round(mean,2),", SD = ",round(sd,2),"\n Shaded Area = ",
round(area,4)))
UnderShade(low=lower,high=bound[1],func=dnorm,mean=mean,sd=sd)
UnderShade(low=bound[2],high=upper,func=dnorm,mean=mean,sd=sd)
axis(2)
places <- c(lower,bound[1],bound[2],upper)
axis(1,at=places,labels=c("",as.character(places[2:3]),""))
}
}
# return(area) we need only the graphs
}#end of pnormGC
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