Comparison of two programs for standardisation of time-series data in dendrochronology

Simon Poljanšek and Špela Jagodic and Tom Levanič (2010) Comparison of two programs for standardisation of time-series data in dendrochronology. Zbornik gozdarstva in lesarstva (93). pp. 11-22. ISSN 0351-3114

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Abstract

Several freeware programs are available for calculation of chronologies. In this paper, we compared two of these programs; the well known ARSTAN and the newly introduced library for standardization dendrochronological data dplR, made for statistical program R. Both are free. ARSTAN is specific and produces chronologies from tree-ring width by standardization, while dplR is a package within the statistical programming environment R, which is able to analyze and present results of other analysis. For comparison of chronologies,made in these two programs, we used different tests. ARSTAN provides many options for calculating chronologies, whereas dplR demands written orders and offers no choices. Differences between built chronologies from these two programs are not statistically significant - programs produce same results comparing basic statistical analysis for average tree-ring width sand standard deviations, but for results of sensitivity and autocorrelation coefficient, there is a difference on a second decimal place. Correlation between standardized chronologies is 0.9773, while between residual chronologies it reaches 0.9776; graphically, the differences are also small and low numbered. As the true difference between the programs lies merely in the working environment, it is for users to decide, which program suit them best.

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