pnormGC {tigerstats}

Graphical Calculator for Normal Curve Probabilities

Description

Shades desired areas under a specified normal curve, returns numerical value of the area.

Usage

pnormGC(bound,region="below",mean=0,sd=1,graph=FALSE)

Arguments

bound

A numerical vector of length 1 or 2, indicating the boundary (respectively, boundaries) of shaded region on the bhorizontal axis

region

A character string. Default is "below". Possible values are "between" (when boundary consists of two numbers), "below", "above", and "outside" (again when boundary consists of two numbers)

mean

Mean of the distribution

sd

Standard deviation of the distribution

graph

Will produce graph of the probability

Value

Numerical value of area under curve over region.

Author(s)

Homer White [e-mail]

Examples

#This gives P(X < 75) for X normal with mean=70 and sd=4:
pnormGC(75,region="below",mean=70,sd=4)

#This gives P(X > 71) for X normal with mean=70 and sd=4:
pnormGC(71,region="above",mean=70,sd=4)

#This gives P(-1 < X < 1), for standard normal X:
pnormGC(c(-1,1),region="between")

#This gives P(X < 68 or X > 71), for X normal with mean =70 and sd=4:
pnormGC(c(68,71),region="outside",mean=70,sd=4)