Visual Recurrence Analysis (VRA) v4.0 Release Notes

Visual Recurrence Analysis (VRA) v4.0 for Windows 95, 98 and NT is a software for topological analysis and qualitative assessment of (chaotic) time series. It can detect hidden patterns and determinism in time series using graphical device known as the Recurrence Plot. VRA first expands a given one-dimensional time series into a higher-dimensional space, in which the dynamics of the underlying generator takes place. VRA then constructs a recurrence plot, which is essentially a graphical representation of the correlation integral in such a way so that the time dependence in the system under study is preserved. 

VRA is very fast and highly interactive. Extensive online help and references are provided. A major addition to VRA 4.0 is nonlinear time series prediction using nonparametric methods. You have a choice of different estimators (Nadaraya-Watson and local linear), kernel functions (Epanechnikov, Gaussian, exponential, uniform, etc.), distance measures (Euclidean, Manhattan, max norm, by cosine, by correlation, etc.), and much more. Other new features include (improved) False Nearest Neighbors method, recurrence histogram, and the support for the data files in MS Excel format (in addition to plain ASCII text, comma-separated (.csv), formatted text (.prn), and sound (.wav) formats). All charts and graphs can now be saved and printed. RQA is slightly modified to reflect users' suggestions.

VRA version 4.0 remains free provided that it is used for educational/academic/research purposes.

I welcome any questions and suggestions you may have regarding 
VRA software and its use. I can be reached by email at eugenek@ix.netcom.com

The latest version of VRA (currently v4.0) can be downloaded from
http://pweb.netcom.com/~eugenek/download.html


