About Dat's Method

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Dat's 0-1 matrix test (Dat, 1982) can detect temporal clustering in single and several time series with group-level data. Use Dat's test with counts, not rates on 5-10 time intervals. Within a time series the method assumes population size does not change through time.

You cannot use Dat's method when the expected number of cases in each interval is smaller than 2. This means the total number of cases in the time series must be greater than twice the number of time intervals. Otherwise, consider using the Empty Cells test. If 11 or more time intervals are present you may be able to aggregate data by combining time intervals.

Dat's method is more sensitive than the Ederer-Myers-Mantel test in detecting multiple clusters within a space sub-unit.

See Also