Song S. Qian, Thomas F. Cuffney, Ibrahim Alameddine, Gerard McMahon, and Kenneth H. Reckhow. 2010. On the application of multilevel modeling in environmental and ecological studies. Ecology 91:355–361.

Supplement

Computer programs in R and data sets used in the paper.
Ecological Archives E091-027-S1.

Copyright

Authors
File list (downloads)
Description

Author(s)

Song Qian
Nicholas School of the Environment
Duke University
Durham, NC 27708-0328
E-mail: song@duke.edu

Thomas Cuffney
U.S. Geological Survey
3916 Sunset Ridge Road
Raleigh, NC 27607

File list

R code and comments		Details of computer programs (in R) used in the paper.
N2O Emission		Data for the N2O emission Example.
rtol		Richness tolerance data for the EUSE Example.
EUSE_ENV_Data		Data for the EUSE example, describing environmental characteristics of each metropolitan area.
EUSE_AG_GRASS		Data for the EUSE example, providing estimated background agricultural land use information.

Description

R programs for the examples in the paper and in Appendix A are in this file.

The N₂O emission data set has seven columns:

	group -	study index, each represent a published study;
	crop -	type of crop used by the study,
	carbon -	soil carbon,
	sample.period -	study duration in days,
	fertilizer -	type of fertilizer used,
	n.input -	amount of nitrogen fertilizer used,
	emission -	N2O emission

 

The richness tolerance data set has eight columns:

	city -	names of metropolitan areas,
	suid -	study unit ID, unique identification number for each metropolitan area (USGS)
	sample -	sample ID, unique identification number for each watershed
	agr -	agricultural land use as a percentage of the watershed area
	richtol -	average tolerance value
	nuii -	national urbanization intensity index

 

Regional environmental data set has seven columns:

	suid -	study unit ID
	city -	names of metropolitan areas
	staid -	USGS station ID
	sname -	site name
	AnnMeanT -	annual mean ambient temperature
	AnnMeanP -	average annual precipitation
	DomEcoReg -	Ecoregion

 

Background agricultural data set has five columns:

	suid -	study unit ID
	city -	names of metropolitan areas
	PNLCD7 -	grassland coverage (%)
	PNLCD8 -	agriculture land cover (%)
	PNLCD78 -	PNLCD7+PNLCD8