## window size

General discussions and questions about recurrence plot related methods.

### window size

Hi,
i try to choose the window size for the windowed recurrence quantification analysis of soccer games. I used the method from Dr. Marvan's diploma thesis. I took increasing window size over the data and calculated the RQA values (wmin = 20 and wmax = 800) . For these i computed the average and the standard deviation for each window size. I ploted the values of L against the increasing window size and the standard deviation against the window size also. for each game L reachs a plateau like it is described in the thesis, but there is no plateau (values are still decreasing) for the standard deviations (RR, DET, LAM, ENT). So i know the minimal window size is at the beginning of the plateau of L, but what i didn't know is how big i can choose the window? Would you call that plateaus? Does anyone have a hint for me? Would be nice.

this is one of my plots:
Window size.png (10.89 KiB) Viewed 5258 times

Best regards
Denise
denise
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Joined: Sun Jun 1, 2014 13:41

### Re: window size

Hello Denise,

the results depend on the window size and also on the length of the entire time series, i.e., how many windows you finally will have. This would need some consideration from your side.

Regarding the plot and the plateaus: I would not really call them plateaus, but after window size 150 the fast decrease of the curves changes to a very slow decrease. Therefore, this value can be considered equivalent as the beginning of the plateau in L.

Hope this helps!

Best
Norbert

Norbert
Expert

Posts: 173
Joined: Wed Jan 4, 2006 11:03
Location: Potsdam Institute for Climate Impact Research, Germany

### Re: window size

Hello Norbert,

Regards!
Denise
denise
Junior

Posts: 7
Joined: Sun Jun 1, 2014 13:41

### Re: window size

Hi @ll,

can you please tell me, where to find this method in the Thesis? Also..is it still applied?

Or are there any new methods for determining an "optimal" window size or some general recommendations respectively?

Thanks
holistic
Senior

Posts: 16
Joined: Wed Feb 19, 2014 09:53

### Re: window size

it is in my quite old diploma thesis in the appendix B (pp. 110) – but only in German.

i have not further considered this issue but would clearly be worth to do it.

Norbert
Expert

Posts: 173
Joined: Wed Jan 4, 2006 11:03
Location: Potsdam Institute for Climate Impact Research, Germany

### Re: window size

Got it thanks! Deutsch ist kein Problem
holistic
Senior

Posts: 16
Joined: Wed Feb 19, 2014 09:53