EPS.value {detrendeR}

Computes general statistics on ring-width series.

Description

Compute general statistics on a data.frame of ring-width series.

Usage

EPS.value(rwl, stc = c(5,2,1))

Arguments

rwl

a data.frame with ring-width values

stc

a vector of three integers giving the Site-Tree-Core mask. Defaults to c(5,2,1) and these three values should sum to eigth. The stc[1] gives the number of characters used to define the site code, stc[2] defines the tree mask and the core ids is given by the last element of the vector stc[3].

Details

This function is a changed version of the Andrew Bunn's rwi.stats function from the dplR package (Bunn, 2008).

Value

A "data.frame" with the following values:

start

the first year

end

the last year

tree

the number of trees

core

the number of cores

n.tot

the number of unique combinations of the input series (i.e., 1/2*n*[n-1])

n.wt

the total number of unique combinations of the within-tree series

n.bt

the total number of unique combinations of the between-tree series

r.tot

the mean of all correlation between different cores

r.wt

the mean of correlations between series from the same tree over all trees

r.bt

the mean interseries correlation between all series from different trees

c.eff

the effective number of cores

r.eff

the effective signal calculated as [rbar.bt / (rbar.wt + (1-rbar.wt) / c.eff)]

eps

the expressed population signal

References

Bunn, A. 2008. A dendrochronology program library in R (dplR). Dendrochronologia 26:115-124.

Cook, E.R., Kairiukstis, L.A. 1990. Methods of Dendrochronology: applications in the environmental sciences. Kluwer Academic Publishers.

Examples

## Not run: 
data(co021, package = "dplR")
years <- as.integer(rownames(co021))
co021.subset <- subset(co021, subset = years >= 1900 & years <= 1950)
## remove the following series "645232","646107" and "646118"
co021.subset <- co021.subset[, !colnames(co021) %in% c("645232", "646107", "646118")]
EPS.value(co021.subset, stc = c(0, 8, 0))

## End(Not run)