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Seasonal Kendall Test with Slope for Serial Dependent Data 1.0

  Date Added: August 24, 2013  |  Visits: 247

Seasonal Kendall Test with Slope for Serial Dependent Data

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Seasonal Kendall Trend Test for Data with and without Searial Dependance.Tau-b seasonal: takes into account ties (and multiple observations, except, the data are preprocessed in a subfucntion and multiple observatiosn per a given season are averaged using median).Tau-a seasonal: does not consider multiple observations per season as ties. The data are preprocessed, seasons with multiple observations are summarized with a median value.This routine will take into data evenly spaced by seasons. Compute Seasonal Tau-b, Tau, Sen's slope and it's confidence intervals.!!! SERIAL CORRELATION IS COMPLETE AND VERIFIED !!!Accounting for Serial Correlation is based on the below paper: Hirsch, R. M., Slack, J. R., A Nonparametric Trend Test for Seasonal Data with Serial Dependence. Water Resources Research Vol 20, No. 6, pages 727-732, June 1984.Modifications: 12/13/2008 - added Homogeneity test of trends for different seasons. 12/17/2008 - added adjustments to significance with serial correlations removed by computing covariance instead of assuming zero. Starting season can be users specified. 12/18/2008 - mulitiple observations in a single season are median averaged. 1/17/2009 - checks for anomalies and provides solutions and/or notifications. Also requires the updated ktaub.m file because of the need for a computed variance with no ies removed.Dependencies: ktaub.m Statistics ToolboxThis function does require ktaub.m which has also been revised to support this function, so if you've previously downloaded ktuab.m, please check to make sure you have the most recent version.Note: Calculating the covariance depends on when your seasons start in the year. For example, the USGS program Kendall.exe will automatically assume that Season 1 is the start of a water year (i.e. Season 1 = October, Season 12 = September). True that the 1984 Hirsch paper is dervied using 12-seasons (i.e. months), it is certainly reasonable to assume that the number of seasons can be something other than 12 months, and not necessariliy starting in October. So this function allows for the user to specify when Season 1 is to start. This nuance is critical because incomplete years are filled in with mid-ranks in the covariance.These seasonal statistics were inspired by: Richard O. Gilbert, Pacific Northwest National Laboratories, "Statistical methods for Environmental Pollution Monitoring", 1987, Van Nostrand Reinhold, New York Publishing, ISBN 0-442-23050-8.A good supporting statistic that may prove useful is performing a global trend test evaluating homogeneity of trends for different stations and seasons. See the posted function namged: GlobalTrends.mdatain structure is assumed to vary as the following:datain(:,1) = Time (e.g. year)datain(:,2) = seasondatain(:,3) = dataalpha = assumed level of confidencewantplot = flag if ~= 0 then a figure will be created if Tau-b issignificant. StartSeason = shift seasons to start with this one. Example: StartSeason = 10 will shift seasons 10 = 1, then years are adjusted to start with the new season shift.Syntax: [taubsea tausea Sens h sig sigAdj Zs Zmod Ss Sigmas CIlower CIupper] = sktt(datain,alpha,wantplot,StartSeason)

Requirements: No special requirements
Platforms: Matlab
Keyword: Critical Necessariliy Nuance Number Reasonable Starting
Users rating: 0/10

License: Shareware Size: 10 KB
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SEASONAL KENDALL TEST WITH SLOPE FOR SERIAL DEPENDENT DATA RELATED
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