Analysis comparing measures of the proportion of basal area to
the proportion of canopy cover of lodgepole pine (Pinus contorta)
in 31 stands of subalpine forest in Colorado (Cade 1997).
Usage
data(agree2)
Format
A data frame with 62 observations on the following 6 variables.
pctscc
The response variable for proportion Englemann spruce.
pctfcc
The response variable for proportion subalpine fir.
pctlcc
The response variable for proportion lodgepole pine.
pctacc
The response variable for proportion aspen.
stand
The grouping variable specifying the 31 sample plots.
method
The blocking variable specifying whether the proportion was measured either for basal area (method = 2) or canopy cover (method = 1).
Source
Cade, B.S. 1997. Comparison of tree basal area and canopy cover in habitat models: Subalpine forest. Journal of Wildlife Management61, 326–335.
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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> library(Blossom)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/Blossom/agree2.Rd_%03d_medium.png", width=480, height=480)
> ### Name: agree2
> ### Title: Lodgepole pine basal area and canopy cover
> ### Aliases: agree2
> ### Keywords: datasets
>
> ### ** Examples
>
> str(agree2)
'data.frame': 62 obs. of 6 variables:
$ pctscc: num 0.2333 0.1509 0.0533 0.3117 0.15 ...
$ pctfcc: num 0.4 0.0943 0.1333 0.6623 0.475 ...
$ pctlcc: num 0.367 0.755 0.813 0.026 0.375 ...
$ pctacc: num 0 0 0 0 0 0 0 0 0 0 ...
$ stand : int 1 2 3 4 5 6 7 8 9 10 ...
$ method: int 1 1 1 1 1 1 1 1 1 1 ...
>
> 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 * 3*r)
+ }
>
> pairs(agree2[,1:4],pch = 21,bg = c("red","grey")[agree2$method],cex = 1.5,
+ upper.panel = panel.cor)
>
>
>
>
>
> dev.off()
null device
1
>