The contingency periodogram for periodicity in categorical time series

Description

A funcion to estimate the contingency periodogram to test for periodicity in categorical time series.

Usage

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    contingency.periodogram(x, maxper = 6)
    

Arguments

x

A vector representing the categorical time series.

maxper

the maximum lag (period) considered.

Details

This is the contingency periodogram of Pierre Legedre and Pierre Dutielle to test for periodicity in categorical time series. I have coded the function so as to provide both the Fisher exact test and the asymptotic chi-square test.

Value

An object of class "contingency.periodogram" is returned consisting of a matrix with a row for each period considered. The columns are:

exact.p

the fischer exact test at each lag.

chi-val

the asymptotic chi-square value.

df

the chi-square degrees-of-freedom.

asympt.p

the chi-squared asymptotic p-value.

Author(s)

Ottar N. Bjornstad onb1@psu.edu

References

Legendre et al. (1981) The contingency periodogram: A method for identifying rhytms in series of nonmetric ecological data. Journal of Ecology, 69, 965-979.

See Also

plot.contingency.periodogram

Examples

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    data(plodia)
    data<-as.factor((scale(plodia) > 0))
    fit <- contingency.periodogram(data, maxper = 9) 
    ## Not run: plot.contingency.periodogram(fit)

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