trend.line {spatialEco}

trend.line

Description

Calculated specified trend line of x,y

Usage

trend.line(x, y, type = "linear", plot = TRUE, ...)

Arguments

x

Vector of x

y

Vector of y

type

Trend line types are: 'linear', 'exponential', 'logarithmic', 'polynomial'

plot

plot results (TRUE/FALSE)

...

Additional arguments passed to plot

Value

A list class object with the following components:

• for type = 'linear' x is slope and y is intercept

• for type = 'exponential', 'logarithmic', or 'polynomial' x is original x variable and y is vector of fit regression line

Author(s)

Jeffrey S. Evans [e-mail]

Examples

x <- 1:10
y <- jitter(x^2)

opar <- par(no.readonly=TRUE)
  par(mfcol=c(2,2))
    trend.line(x,y,type='linear',plot=TRUE,pch=20,main='Linear')
    trend.line(x,y,type='exponential',plot=TRUE,pch=20,main='Exponential')
    trend.line(x,y,type='logarithmic',plot=TRUE,pch=20,main='Logarithmic')
    trend.line(x,y,type='polynomial',plot=TRUE,pch=20,main='Polynomial')
 par(opar)