trendHomog: Trend homogeneity test

In wql: Exploring Water Quality Monitoring Data

Trend homogeneity test

Description

Tests for homogeneity of seasonal trends using method proposed by van Belle and Hughes (1984). Seasons with insufficient data as defined in mannKen are ignored.

Usage

trendHomog(x)

Arguments

x	A vector time series with frequency > 1

Value

chisq.trend	"Trend" chi-square.
chisq.homog	"Homogeneous" chi-square.
p.value	For null hypothesis that trends are homogeneous.
n	Number of seasons used.

Author(s)

Alan Jassby, James Cloern

References

van Belle, G. and Hughes, J.P. (1984) Nonparametric tests for trend in water quality. Water Resources Research 20, 127-136.

See Also

seaKen

Examples

## Apply to a monthly vector time series to test homogeneity
## of seasonal trends.
x <- sfbayChla[, 's27']
trendHomog(x)

wql documentation built on May 29, 2024, 6:32 a.m.