Phicoefficient is the recurrence observed between the two timeseries on a specific state k. The phi(k) coefficient increases with the frequency of matching recurrence on the same state (k ; k) and away from this state (not k ; not k) between the two timeseries. On the other hand, phi(k) decreases with the frequency of mismatching objects (k; notk, and vice versa).
1  calcphi(t1, t2, ws, k)

t1 
First timeseries 
t2 
Second timeseries 
ws 
Number of delays (+/) considered 
k 
The categorical state on which phi is calculated 
It returns the recurrence phicoefficient profile for state k for all delays considered
Moreno I. Coco (moreno.cocoi@gmail.com)
Dale, R., Warlaumont, A. S. and Richardson, D. C. (2011). Nominal cross recurrence as a generalized lag sequential analysis for behavioral streams. International Journal of Bifurcation and Chaos, 21, 11531161. (special issue on recurrence)
CTcrqa
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