Learning to Love dplR
Or Using R for Tree-Ring Analysis
Chapter 1 Preamble
R is both a programming language and a software environment for statistical computing. It is free and open-source, licensed under the GNU General Public License. The Dendrochronology Program Library in R (
dplR) is an add-on package for R that performs many of the standard tasks in tree-ring analysis including cross-dating, detrending, chronology building, spectral and wavelet analyses, and so on.
In this document, we will use example ring-width files from the ITRDB to demonstrate the functionality of
R environment is powerful and flexible and its use allows great transparency in presenting data results. An advantage of
dplR’s open-source licensing is that one has the option to modify or add to the library’s functionality for performing specific experiments or producing custom figures.
In the following pages we will cover the basics of
dplR, crossdating, and some limited time-series analysis. Users should be familiar with the basics of dendrochronology and concepts like detrending, autocorrelation, spectral analysis and so on.
If this is all new to you – you should proceed immediately to a good primer on dendrochronology like Fritts (2001) or the Cook Book (1990). These pages are not intended to teach you about how to do tree-ring analysis. They are intended to teach you how to use R for dendro.
Please note! This is a very drafty document and there are typos and all kinds of silliness in it.
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