trend.line
From spatialEco v1.3-2
by Jeffrey S Evans
trend.line
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
Examples
# NOT RUN {
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)
# }
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