Function calculates stand Pointer-year values from values of each tree, comparing year increment with previous five years mean increment. Pointer-year clases are determined in 20% steps.
As input argument one data frame in given. First column of data frame should contain year values and rest columns contain tree-ring width measurements.
Function transforms WinDendro .txt files to data frame where first column contains year and the rest columns are tree ring measurament data.
Function needs to parameters - name of the WinDendro file (quoted), and which parameter to use (r.par=). If parameter is not given, then "RINGWIDTH" will be used. Other possibilities are "EARLYWIDTH" and "LATEWIDTH".
At this moment function works only with version 3 WinDendro files.
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