Acorn Production

Description

Acorn production data as related to oak (Quercus spp.) forest characteristics.

Usage

data(acorn)

Format

A data frame with 43 observations on the following 2 variables.

wtperha

Annual acorn biomass (kg/ha).

oakccsi

Forest suitability index based on canopy cover and number of oak species.

Source

Schroeder, R.L. and L.D. Vangilder. 1997. Tests of wildlife habitat models to evaluate oak mast production. Wildlife Society Bulletin 25, 639–646.

References

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

Examples

str(acorn)
plot(acorn$oakccsi,acorn$wtperha,xlab = "Acorn suitability index",ylab = "Kg Acorns per ha")

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(Blossom)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/Blossom/acorn.Rd_%03d_medium.png", width=480, height=480)
> ### Name: acorn
> ### Title: Acorn Production
> ### Aliases: acorn
> ### Keywords: datasets
> 
> ### ** Examples
> 
> 
> str(acorn)
'data.frame':	43 obs. of  2 variables:
 $ wtperha: num  43.04 4.95 60.22 81.66 50.62 ...
 $ oakccsi: num  0.826 0.115 0.447 0.9 0.529 ...
> plot(acorn$oakccsi,acorn$wtperha,xlab = "Acorn suitability index",ylab = "Kg Acorns per ha")
> 
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>