rline {LearnEDA}R Documentation

Resistant line

Description

Fits Tukey's resistant line of form a + b (x - xC).

Usage

rline(x,y,iter=1)

Arguments

x numeric vector of values of explanatory variable
y numeric vector of values of response variable
iter number of iterations of algorithm

Value

a value of intercept a
b value of slope b
xC value of xC
half.slope.ratio value of half slope ratio after one iteration
residual vector of residuals

Author(s)

Jim Albert

Examples

x=1:10
y=3*x+rnorm(10,0,1)
y[1]=20
fit=rline(x,y,iter=5)
plot(x,y)
curve(fit$a+fit$b*(x-fit$xC),add=TRUE)
# contrast with least-squares fit
abline(lm(y~x))

[Package LearnEDA version 1.01 Index]