Search found 175 matches

by Norbert
Wed Sep 3, 2014 18:19
Forum: General Discussion
Topic: CRPs and twin surrogate data
Replies: 1
Views: 3171

Re: CRPs and twin surrogate data

Yes, this is correct
by Norbert
Fri Aug 22, 2014 06:47
Forum: General Discussion
Topic: Beginner: application of the rqa in psychology
Replies: 3
Views: 5583

Re: Beginner: application of the rqa in psychology

Probably your two data sets have different length. Both for the crqa, both data sets should have equal length.
by Norbert
Fri Aug 22, 2014 06:34
Forum: Multivariate Extensions and Spatial Data
Topic: The data of Multi-dimensional
Replies: 1
Views: 3592

Re: The data of Multi-dimensional

Hi,

in this case you have to use the function crp2 of the CRP Toolbox.

Best
Norbert
by Norbert
Fri Aug 22, 2014 06:33
Forum: General Discussion
Topic: cross recurrence plot
Replies: 2
Views: 4231

Re: cross recurrence plot

Hi,

you can use the function crqad of the CRP Toolbox.

Best
Norbert
by Norbert
Wed Jul 16, 2014 13:06
Forum: Applications
Topic: JRP Function
Replies: 12
Views: 20471

Re: JRP Function

If you use x and y as the state components then the assumption is that both form the phase space, i.e., embedding is usually not necessary. If you chose embedding anyway, then the embedding need to be the same for both. Theoretically, one should consider to use the highest embedding dimension, but p...
by Norbert
Thu Jul 3, 2014 08:14
Forum: General Discussion
Topic: RP with reaction times: Dimension and delay
Replies: 2
Views: 4275

Re: RP with reaction times: Dimension and delay

Hi, I think an answer depends on your research question. For example, do you need a time resolved RQA? From your plots I can see that you divided your very short time series again in smaller chunks of length 40. This is really very short. You should know that then the statistical reliability of the ...
by Norbert
Wed Jun 25, 2014 15:40
Forum: Applications
Topic: JRP Function
Replies: 12
Views: 20471

Re: JRP Function

you can plot with

Code: Select all

imagesc(R1)
axis xy square
colormap([1 1 1;0 0 0])
or you can simply use the interactive mode of the function:

Code: Select all

crp2(x,…)
(simply drop the left-hand output argument)
by Norbert
Wed Jun 25, 2014 06:13
Forum: General Discussion
Topic: Beginner: application of the rqa in psychology
Replies: 3
Views: 5583

Re: Beginner: application of the rqa in psychology

you can use the function crp2 in the CRP toolbox. this allows you to consider the x- and y-component as the dimensions of the phase space trajectory directly. if your data vector x is as you wrote with 1st column as time, 2nd column the x-component, and 3rd column the y-component, then you can do cr...
by Norbert
Wed Jun 25, 2014 06:09
Forum: Applications
Topic: JRP Function
Replies: 12
Views: 20471

Re: JRP Function

Hi Denise, interesting data, indeed! :D What you did is the construction of the joint recurrence plot. This is one possible solution. I am not sure why you have multiplied also the 2nd player with the 1st player. But when you simply multiply the RPs of the x- and y-component of the 1st player, this ...
by Norbert
Mon Jun 2, 2014 08:26
Forum: Quantification
Topic: time delay
Replies: 4
Views: 7671

Re: time delay

Hi, when using the ACF, I would suggest to chose a delay where the ACF value falls below 1/e. Using MI, I agree with your selection of 200. Regarding your question on the selection for each time series: it depends on the research question. Without knowing more about the data and the research questio...
by Norbert
Sat May 17, 2014 20:52
Forum: General Discussion
Topic: Recurrence Plot for binary variable?
Replies: 6
Views: 9271

Re: Recurrence Plot for binary variable?

I would suggest to use the option "nonorm" to avoid the centering and standardisation of the data. When using embedding dimension of 1 the results should be the same for Euclidean and Maximum norm. The interpretation is similar but be aware that there is no phase space trajectory. We could also cons...
by Norbert
Fri May 16, 2014 12:23
Forum: General Discussion
Topic: Recurrence Plot for binary variable?
Replies: 6
Views: 9271

Re: Recurrence Plot for binary variable?

There is nothing to be implemented further. If you have only a binary time series, you just need to ensure that your threshold is smaller than 1. This will give the same results as using the identity relationship (i.e., threshold = 0).
by Norbert
Thu May 15, 2014 20:05
Forum: General Discussion
Topic: Recurrence Plot for binary variable?
Replies: 6
Views: 9271

Re: Recurrence Plot for binary variable?

Yes, this is possible. This is also called "recurrence on a nominal scale" or "symbolic recurrences". There are several studies already using this approach. The difference to the standard recurrence approach is that instead of a neighbourhood of some size ε a recurrence can now be defined by the exa...
by Norbert
Thu May 1, 2014 22:19
Forum: Bugs
Topic: bug in fnn.m ?
Replies: 1
Views: 3942

Re: bug in fnn.m ?

Thanks for your careful checking of the code. You are probably right! In the original version, the embedding used a fixed delay of tau = 1. Therefore, the considered line is a relict of these days. But as you said, it should be corrected to consider the delay. I will check the code and improve it wi...