Scripts and data for estimating quantile equivalence for Ambystoma tigrinum trends (Dixon and Pechmann 2005) with the quantreg package in R.
Ecological Archives A021-013-S3.
Authors
File list (downloads)
Description
Brian S. Cade
Fort Collins Science Center, U.S. Geological Survey
2150 Centre Ave., Bldg. C
Fort Collins, CO 80526
E-mail: cadeb@usgs.gov
trends.rtf is a text file with commands for implementing the quantile regression analyses on Ambystoma tigrinum trends in the text file Ambystoma.tigrinum.csv using the quantreg package in R.
Ambystoma.tigrinum.csv
Column 1: species - amphibian species,
Column 2: year - year of count,
Column 3: abundance - numbers per constant effort search,
Column 4: lagabundance - abundance lagged 1 year.
trends.rtf
Literature Cited
Dixon, P. M., and J. H. K. Pechmann. 2005. A statistical test to show negligible trend. Ecology 86:1751–1756.
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