Blossom (version 1.4)

lily: Lily seedling counts

Description

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

Usage

data(lily)

Format

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.

Source

Cade, B.S., Terrell, J.W. and Schroeder, R.L.. 1999. Estimating effects of limiting factors with regression quantiles. Ecology 80, 311--323.

Examples

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")