Description Usage Arguments Details Value Author(s) References Examples
Computes the NET parameter for a set of tree-ring records or other time-series data.
1 |
x |
A |
weights |
A |
This function computes the NET parameter (Esper et
al., 2001). The overall NET is an average of all
(non-NA
) yearly values NET[j], which are
computed as follows:
NET[j] = v[j] + (1-G[j])
The yearly variation v[j] is the standard deviation of the
measurements of a single year divided by their mean.
Gegenläufigkeit 1-G[j] is based
on one definition of Gleichläufigkeit
G[j], similar to but not the same as what glk
computes. Particularly, in the formula used by this function (Esper
et al., 2001), simultaneous zero differences in two series are not
counted as a synchronous change.
The weights of v[j] and 1-G[j] in the sum can
be adjusted with the argument weights
(see above). As a
rather extreme example, it is possible to isolate variation or
Gegenläufigkeit by setting one of the weights
to zero (see ‘Examples’).
A list
with the following components, in the same order as
described here:
all |
a |
average |
a |
Mikko Korpela
Esper, J., Neuwirth, B., and Treydte, K. (2001) A new parameter to evaluate temporal signal strength of tree-ring chronologies. Dendrochronologia, 19(1), 93–102.
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