Hi everyone,
I have studied about postural fluctuations during quiet stance and I need to establish the radius for the RQA analysis. I read that it can be used 10% of the mean distance between data points in the reconstructed space. What is difficult to me is to calculate this mean. What is the best form?
Thank you,
Paula Arantes
RQA and radius calculation
 Norbert
 Expert
 Posts: 195
 Joined: Wed Jan 4, 2006 11:03
 Affiliation (Univ., Inst., Dept.): Potsdam Institute for Climate Impact Research, Germany
 Location: Potsdam, Germany
 Location: Potsdam Institute for Climate Impact Research, Germany
Re: RQA and radius calculation
Hi Paula,
you can use the CRP toolbox for Matlab. There is the function pss which calculates the mean and maximal phase space diameter (depending on the embedding parameters). You can also normalise your data to standard deviation 1 and then use the threshold as a fraction of the standard deviation. I would like to suggest reading the following paper:
S. Schinkel, O. Dimigen, N. Marwan: Selection of recurrence threshold for signal detection, European Physical Journal – Special Topics, 164(1), 45–53 (2008). http://www.recurrenceplot.tk/bibliogra ... hinkel2008
Best regards
Norbert
you can use the CRP toolbox for Matlab. There is the function pss which calculates the mean and maximal phase space diameter (depending on the embedding parameters). You can also normalise your data to standard deviation 1 and then use the threshold as a fraction of the standard deviation. I would like to suggest reading the following paper:
S. Schinkel, O. Dimigen, N. Marwan: Selection of recurrence threshold for signal detection, European Physical Journal – Special Topics, 164(1), 45–53 (2008). http://www.recurrenceplot.tk/bibliogra ... hinkel2008
Best regards
Norbert

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 Posts: 4
 Joined: Sun Feb 10, 2013 21:29
 Affiliation (Univ., Inst., Dept.): Federal University of Campina Grande
 Location: Campina Grande, Brazil
 Research field: Engeneering
Re: RQA and radius calculation
Prof,
Does CRP toolbox computes the measures for time series with many samples?
Thanks
Does CRP toolbox computes the measures for time series with many samples?
Thanks
Vinícius Jefferson Dias Vieira, M.Sc.
Electrical Engineering Department,
Federal University of Campina Grande, Brazil
Electrical Engineering Department,
Federal University of Campina Grande, Brazil
 Norbert
 Expert
 Posts: 195
 Joined: Wed Jan 4, 2006 11:03
 Affiliation (Univ., Inst., Dept.): Potsdam Institute for Climate Impact Research, Germany
 Location: Potsdam, Germany
 Location: Potsdam Institute for Climate Impact Research, Germany
Re: RQA and radius calculation
Hi,
waht do you mean with many samples? If you ask for the maximal length of time series which can be used in CRP toolbox, just read the FAQ:
http://tocsy.pikpotsdam.de/CRPtoolbox/ ... tml#length
waht do you mean with many samples? If you ask for the maximal length of time series which can be used in CRP toolbox, just read the FAQ:
http://tocsy.pikpotsdam.de/CRPtoolbox/ ... tml#length

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 Joined: Wed May 29, 2013 09:55
 Affiliation (Univ., Inst., Dept.): University
 Location: Faiiasalabadandlhr
 Research field: marketingmix
Re: RQA and radius calculation
your other question about the clusters is not really clear to me. are you asking to just remove the main diagonal.
honey

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 Joined: Sun Jun 16, 2013 18:22
 Affiliation (Univ., Inst., Dept.): Saha Institute of Nuclear Physics
 Location: kolkata,West Bengal,India
 Research field: Non linear Dynamics
Re: RQA and radius calculation
Hi
can any one tell me how will i get back my signal again from the recurrence plot?
can any one tell me how will i get back my signal again from the recurrence plot?