511 classes

gnorm

R Documentation

Graphing a Normal Distribution (from Brett Larget)

Description

gnorm plots a density function for a normal distribution of specified mean and standard deviation. It will also accept specification of one, or two "cutpoints" and shade the corresponding tail regions or the region between two cutpoints. The function also displays the corresponding tail or region probability.

Usage

gnorm(mu, sigma, a = NA, b = NA, findquantile = NA)

Arguments

`mu`	`mu` is the Normal Distribution mean. Required. Use 0 for std normal.
`sigma`	`sigma` is the Normal Distribution Std Deviation. Required. Use 1.0 for std normal.
`a`	optional specification of a quantile value that can serve as a "cutpoint". `gnorm` will shade the tail region demarcated by this value. `a` can be used in conjunction with `b` to find probabilities between the two values.
`b`	optional specification of a quantile value that can serve as a "cutpoint". `gnorm` will shade the tail region demarcated by this value. `b` can be used in conjunction with `a` to find probabilities between the two values.
`findquantile`	Takes a cumulative left tail probability for which a quantile is returned. Default is NA. Arguments `a` and `b` override `findquantile`

Note

This function can be very helpful in an instructional setting.

Author(s)

Bruce Dudek bruce.dudek@albany.edu

References

This function is a modification of a function coded by Brett Larget, Univ Wisconsin.
http://www.stat.wisc.edu/~larget/R/prob.R

Examples


gnorm(0,1)
gnorm(0,1,a=1.65)
gnorm(0,1,a=-1.65)
gnorm(0,1,b=1.65)
gnorm(0,1,a=1.65,b=1.65)
gnorm(0,1,a=1.96,b=-1.65)
gnorm(100,15,a=130)
gnorm(100,15,a=85)
gnorm(100,15,a=85,b=115)
gnorm(800,20,a=837,b=763)

bcdudek/bcdstats documentation built on Jan. 3, 2024, 10:09 p.m.