ptGC {tigerstats}

Graphical Calculator for t-Curve Probabilities

Description

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

Usage

ptGC(bound,region="between",df=1,graph=FALSE)

Arguments

bound

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

region

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

df

degrees of freedom of the distribution

graph

produce graph?

Value

Numerical value of area under curve over region. Also plots the t-curve with the shaded area.

Author(s)

Homer White [e-mail]

Examples

#This gives P(-2 < t < 2) for a t-random variable with 1 degree of freedom:
ptGC(c(-2,2),region="between",df=1)

#This gives P(t < -1) for a t-random variable with 5 degrees of freedom:
ptGC(-1,region="below",df=5)

#This gives P( t < -2 OR t >2), for a t-random variable with 5 degrees of freedom:
ptGC(c(-2,2),region="outside",df=5)