strify {mefa}R Documentation

Stratifies Object of Class 'xcount' or 'mefa'

Description

Stratifies an object of class 'xcount' or 'mefa' according to levels of a factor, or sample/species attribute, respectively.

Usage

strify(xc, strata, which = c("samples", "species"))

Arguments

xc an object of class 'xcount' or 'mefa' to be stratified.
strata a vector with length equal to the number of samples/species (according to which argument). For a 'mefa' object strata is a column within the samples/species attribute table (according to which argument).
which switch between rows ("samples") and columns ("species") to be stratified.

Value

A result is an object of class 'xcount'.

segment segment of the original object.
data matrix containing count data of sample/species crosstabulation with dimensions according to stratification. Total count value is the same for the new object, but counts within strata are summed according to stratification.
nsamples number of rows (samples) in data.
nspecies number of columns (species) in data.

Author(s)

Peter Solymos, Solymos.Peter@aotk.szie.hu, http://www.univet.hu/users/psolymos/personal/

See Also

as.xcount, check.attrib, mefa, sscount, xcount, xorder

Examples

## Not run: 
data(landsnail, vhabitat, vsample, vtable)

v1 <- as.xcount(vtable, FALSE, segment="mixed")
spec <- xorder(v1, which="species", landsnail, 2)
sampl <- xorder(v1, which="samples", vsample)
vmf <- mefa(v1, sampl, spec)

v2 <- strify(vmf, strata = "site.descr", which = "samples")
v2

check.attrib(v2, which="samples", vhabitat, 2)
habi <- xorder(v2, which="samples", vhabitat, 2)
vmf2 <- mefa(v2, habi, spec)

v3 <- strify(vmf2, strata = "familia", which = "species")
v3
## End(Not run)

[Package mefa version 1.0 Index]