NSM3 (version 1.5)

theil: Function to estimate and perform tests on the slope and intercept of a simple linear model.

Description

This code estimates and performs tests on the slope and intercept of a simple linear model. Based on chapter 9 of Hollander, Wolfe & Chicken, Nonparametric Statistical Methods, 3e.

Usage

theil(x=NULL, y=NULL, alpha=0.05, beta.0=0, type="t",  example=FALSE, r=3, slopes=F, doplot=TRUE)

Arguments

x

first data vector

y

second data vector

alpha

the significance level

beta.0

the null hypothesized value

type

can be "t" (two-sided), "u" (upper) or "l" (lower). The type refers both to the test and the confidence interval.

example

if true, will analyze the data from Example 9.1

r

the number of places for rounding. Increase it if your P-values are coming out as 0 or 1.

slopes

if true, will print all n(n-1)/2 slopes

doplot

if true, will plot the data and estimated line

Examples

##Example 9.1 Hollander-Wolfe-Chicken##
theil (x, y, example=TRUE, slopes=TRUE)