Description Usage Format Source Examples
Glacier lily (Erythronium grandiflorum) seedlings as a function of number of flowers and an index of rockiness in n = 256 contiguous 2 x 2 m quadrats
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A data frame with 256 observations on the following 3 variables.
seedlings
The number of glacier lily seedlings in a given 2 x 2 m quadrat.
flowers
Number of flowers in the 2 x 2 m quadrat.
rockiness
The rockiness index (a number between 1 and 256) for the 2 x 2 m quadrat.
Cade, B.S., Terrell, J.W. and Schroeder, R.L.. 1999. Estimating effects of limiting factors with regression quantiles. Ecology 80, 311–323.
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(lily, lower.panel = panel.smooth, upper.panel = panel.cor,col = "grey38",
pch = 19,lwd = 2,
main = "Glacier lily seedlings relationship to \nnumber of flowers and rockiness")
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