i need to analyze rainfall data in which I want to Identifying the frequency of rainfall relationship with the amount of rain.. Is there any good statistic method that i can use to identify this??
Deana Zainal,
I hope you doing well.
i suggested a good statistical analysis method. please see attached link i think it will helpful for you.
http://www.readcube.com/articles/10.1029%2FJZ064i005p00541?r3_referer=wol&tracking_action=preview_click&show_checkout=1&purchase_referrer=onlinelibrary.wiley.com&purchase_site_license=LICENSE_DENIED_NO_CUSTOMER
http://indico.ictp.it/event/a12165/session/21/contribution/16/material/0/0.pdf
http://meteora.ucsd.edu/cap/pdffiles/med_trend_rainfall_longobardi.pdf
Hi Deana,
The simplest way to study frequency with magnitude of a given variable is to plot a histogram of the variable. If you have a dataset with rainfall data, say, 'rainf', you can plot the histogram in R using the command: hist(rainf,breaks=10). The argument 'breaks' gives you the number of bins in the x-axis (rainfall magnitude).
Hope this helps,
Augusto
Dear Deana Zainal
I suggest you dowload the khronostat free software
http://www.hydrosciences.org/spip.php?article239
and cick on the text below to download the setup file
"Logiciel d’installation (ReadMe)"
It allows several statistical tests on time series, like Lee and Heghinian, Pettit, Hubert's bayesian test, autocorrelation, etc...
I hope it is useful
Gil
You can go through this excellent video tutorial course and develop some background and can use it in you analysis.
Please go through the link:
https://www.youtube.com/watch?v=2a1I4Fy65qQ&list=PL5C8706F233EDBF73&index=24
Go through Lec number 24 onwards for frequency analysis
Regards
Pankaj
hi Augusto..
thank you for your suggestion.. but can i ask u 1 more ? because im still no clearly understand.. ok.. if i use His in R command... then can i get the relationship btwen frequency of rain day wit the amount of rainfall(mm) as i have a set of 33 years of daily rainfall data for 1 station... means that how can i get the ans of the relationship bet this?
Dear Deana,
I am attaching a histogram of maximum daily wind speed calculated from 66 years of records at Sydney airport (Australia). The x-axis is the speed magnitude in m/s, the y-axis gives the frequency (how many times) that magnitude appears in the dataset using bins of 1 m/s. For instance, speeds between 9 and 10 m/s appears 24000 times, it is the peak of the distribution. A series of parameters of the dataset, which provides further information on the data distribution, are printed on the right hand side. As you can see this histogram gives a lot of information about your data. Observe that the mean of the distribution is located at 12.4 m/s while the maximum value of wind speed is 42.2 m/s.
Hope this helps.
Regards,
Augusto
Dear Gil,
thank you for ur response... i surely will try as b4 this im using R studio to do all my statistic work... i also not very familiar using any software.. so thanx again Gil :)
We have developed a resampling technique that allows generating long time-series and preserve complex patterns of rainfall frequency and intensity. This way you can derive more robust stats and uncertainty quantification.
https://doi.org/10.5194/hess-18-3015-2014
Here you find a tutorial to use the same technique with a free software:
https://bitbucket.org/orianif/g2s_time_series_tutorial/src/master/
Hope it helps,
Fabio
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