wql: trendHomog – R documentation

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trendHomog

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.

Examples

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

wql

Exploring Water Quality Monitoring Data

v0.4.9

GPL-2

Authors

Alan Jassby [aut], James Cloern [ctb], Joseph Stachelek [ctb, cre]

Initial release