chron {dplR} | R Documentation |
This function builds a mean value chronology, typically from a data.frame
of detrended ring widths as produced by detrend
.
chron(x, prefix = NULL, biweight = TRUE, prewhiten = FALSE)
x |
a data.frame of ring widths with rownames(x) containing years
and colnames(x) containing each series id such as produced by
read.rwl |
prefix |
a character vector with a length of < 4. Defaults to xxx |
biweight |
Logical flag. If TRUE then a robust is calculated
using tbrm. |
prewhiten |
Logical flag. If TRUE each series is whitened using
ar prior to averaging. |
This either averages the rows of the data.frame
using a mean or a
robust mean (the so-called standard chronology) or can do so from the
residuals of an ar process (the residual chronology).
A data.frame
with the standard chronology, redisual chronology (if
prewhitening was performed), and the sample depth.
Andy Bunn
Cook, E. R. and Kairiukstis, L.A. (1990) Methods of Dendrochronology: Applications in the Environmental Sciences. Springer. ISBN-13: 978-0792305866.
Fritts, H.C. (2001) Tree Rings and Climate. Blackburn. ISBN-13: 978-1930665392.
data(ca533) ca533.rwi <- detrend(rwl = ca533, method = "ModNegExp") ca533.crn <- chron(ca533.rwi, prefix = "CAM") # With residual chron ca533.crn <- chron(ca533.rwi, prefix = "CAM", prewhiten = TRUE)