About Site Map Submit Contact Us Log in | Create an account
Create an account Log In
Average Rating
User Rating:
Visitors Rating:
My rating:

Write review
See full specifications

scripts default iconHomogeneity test of Global Trends using Chi-Square on Mann-Kendall (Scripts) Publisher's description

o stay consistent with the previous trend statistics posted (ktaub, sktt, and SenT)

GlobalTrends- Homogeneity tests for multiple seasons and stations. This function will test for trends when seasonality is present and over multiple observation stations, all of which are Chi-square statistics. There are so many statistical tests being done, this function is more like a script or program than a function, but I prefer operating with functions.

This function relies heavily on Matlab's Statistical Toolbox for obtaining Chi-square values and ktaub.m function.

These tests will allow for ties, missing data, and multiple observations per time index, since it uses the enhanced ktaub.m function that was recently updated.

There are numerous narratives as part of the output to the screen providing supporting interpretation of the results.

This function is based on Chapter 17.5 in Gilbert.

[ChiOutput K M sig] = GlobalTrends( datain, alpha )

To stay consistent with the previous trend statistics posted (ktaub, sktt, and SenT), data are expected to be in the following structure:
datain(:,1) = Year
datain(:,2) = season
datain(:,3) = value
datain(:,4) = station
alpha = scaler (e.g. 0.05)

ChiOutput structure is like the following (labels are not included)
Total: Chi-square df p-value
Homogeneity: Chi-square df p-value
Season: Chi-square df p-value
Station: Chi-square df p-value
Station-Season: Chi-square df p-value
Trend: Chi-square df p-value

And depending on significances of Stations, Seasons, and StationSeasons, one of three other outpus may occur:
K: significance of Seasons per station
M: significance of Stations for seasons

And when seasonal trend tests should not be done
sig: individual station-season p-values are given by row

There is a lot of output to the screen as well, but using fprintf, one could easily redirect output to a file.
- Matlab Statistical Toolbox
- ktaub.m

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.

One last note. I’ve posted enough functions that it makes sense to constitute forming a Matlab toolbox…so it’s in the works (slowly).

System Requirements:

MATLAB 7.7 (R2008b)
Program Release Status: New Release
Program Install Support: Install and Uninstall

Homogeneity test of Global Trends using Chi-Square on Mann-Kendall (Scripts) Tags:

Click on a tag to find related softwares

Is Homogeneity test of Global Trends using Chi-Square on Mann-Kendall (Scripts) your software?

Manage your software

Most Popular

scripts default icon ASK, OOK, FSK, BPSK, QPSK, 8PSK modulation 1.1
ASK, OOK, FSK, BPSK, QPSK, 8PSK modulation contain several functions for digital modulation simulation
scripts default icon Simulink Communication Labs 1.1
Simulink Communication Labs allows you to learn communication systems in greater depth.
scripts default icon M-QAM modulation and demodulation 1.1
M-QAM modulation and demodulation is the QAM modulation and demodulation tech.
scripts default icon LZW Compression/Decompression 1.1
LZW Compression/Decompression - Updated LZW compressor and decompressor with reasonable performance
scripts default icon InSPIRE utility to plot a 2D displacement field (Scripts) 1.0
This program plots the deformation field (displace vectors) contained in vector.txt.