Description Usage Format Source Examples
Lodgepole pine and Engelmann spruce canopy cover modeled as a function of basal area and density of the trees with least absolute deviation regression.
1 |
A data frame with 31 observations on the following 11 variables.
apico
Basal area (m^2/ha) of lodgepole pine adjusted for slope of terrain.
apien
Basal area (m^2/ha) of Engelmann spruce.
apien2
Basal area squared of Engelmann spruce.
lcc
Lodgepole pine canopy cover.
scc
Englemann spruce canopy cover.
picopha
Lodgepole pine stem density (number/ha).
pienpha
Englemann spruce stem density (number/ha).
z81
The transformation lcc-.81(apico).
z105
The transformation lcc-1.05(apico).
z50
The transformation lcc-.50(apico).
z90
The transformation lcc-.90(apico).
Cade, B.S. 1997. Comparison of tree basal area and canopy cover in habitat models: Subalpine forest. Journal of Wildlife Management 61, 326–335.
1 2 3 4 5 6 7 8 9 10 11 12 13 | panel.cor <- function(x, y, digits = 2, prefix = "", cex.cor, ...)
{
usr <- par("usr"); on.exit(par(usr))
par(usr = c(0, 1, 0, 1))
r <- abs(cor(x, y,method = "spearman"))
txt <- format(c(r, 0.123456789), digits = digits)[1]
txt <- paste(prefix, txt, sep = "")
if(missing(cex.cor)) cex.cor <- 0.8/strwidth(txt)
text(0.5, 0.5, txt, cex = cex.cor * r)
}
pairs(fraserf[,c(1,2,4,5,6,7)],main = "Lodgepole pine data\n with Spearman correlation coefficient",
lower.panel = panel.smooth, upper.panel = panel.cor)
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