I am doing a trend analysis for vegetation dynamics using Mann-Kendall test for trend detection and Sen's slope for computing the magnitude of the trend. There are 6 sites inside a conservation area and 6 outside. Below is is an example for one variable. I need some help with the interpretation.
I understand that the negative sign of the score implies a negative trend. But what about the score itself, what does that mean? Is there a critical value to compare the score and decide on the strength of the trend?
What does the p value suggest?
Does tau describe the strength of correlation between X (time) and Y (small integral in this case)?
I have such trends for 60 and 6 variables sites. What more can I do to compare trends inside and outside conservation areas?
Please suggest relevant literature if possible.
Thanks in advance
Non-parametric Mann-Kendall test is commonly employed to detect monotonic trends in series of environmental data, climate data or hydrological data. The null hypothesis, H0, is that the data come from a population with independent realizations
and are identically distributed. The alternative hypothesis, HA, is that the data follow a monotonic trend. Probably this link helps you:
https://cran.r-project.org/web/packages/trend/vignettes/trend.pdf
Non-parametric Mann-Kendall test is commonly employed to detect monotonic trends in series of environmental data, climate data or hydrological data. The null hypothesis, H0, is that the data come from a population with independent realizations
and are identically distributed. The alternative hypothesis, HA, is that the data follow a monotonic trend. Probably this link helps you:
https://cran.r-project.org/web/packages/trend/vignettes/trend.pdf
Thank you very much Moacir Marocolo and Charles Onyutha. The papers were indeed very helpful. Appreciate your help.
Regards
Get a PROUCL software, run the non-parametric Mann-Kendall to obtain the test statistics. the behaviour of the plot will tell you if there is a decreasing monotonic trend or increasing monotonic trend. the magnitude of the trend as estimated using Sen's slope will also be provided by the software
@ Rudolph Ilaboya I want to perform Mann-Kendall for raster data . Need your guidance how can I do it
What level of significance have you set? Kindly see this literature.
What is the difference between mann-kendall and sen’s slope indicates
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