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Trend-Duration-Frequency

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Trend-Duration-Frequency

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Test for trends in extreme values of data for several quantiles and data resolutions

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Description

Software for testing for trends in extreme high values of data series. Significance of trends is estimated for several data resolutions and several values of quantiles.

More information on methodology
http://www.ida.liu.se/~agbur/Software.htm

MATLAB release MATLAB 7.7 (R2008b)
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23 Oct 2012 Patrick

Tried to run the TDF function. The description is rather short and an example is missing (at least to my feeling). Finally, I had a problem with the decluster function, which is possibly due to incorrect setting of the variable resolution (in the TDF function it is said:

% resolution - a vector of multipliers. Default - 1.
%
% For example, if obs_per_day=24 resolution=[1 3 12]results will be
% calculated for hourly observations, for a sum of 3 hour observations and
% for a sum of 12 hour observations. Note that the lowest resolution that
% procedure can handle is one observation per 3 days.

I created a vector of ones for the resolution, and used daily data. The resulting warning is:

Decluster parameter too large

Please clarify how to set resolution e.g. for a time series with daily resolution.

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