R: Extract the phi-coefficient observed between the two...
calcphi
R Documentation
Extract the phi-coefficient observed between the
two time-series on a specific state k.
Description
Phi-coefficient is the recurrence observed between the two
time-series 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 time-series. On the other hand, phi(k) decreases with the
frequency of mismatching objects (k; not-k, and vice versa).
Usage
calcphi(t1, t2, ws, k)
Arguments
t1
First time-series
t2
Second time-series
ws
Number of delays (+/-) considered
k
The categorical state on which phi is calculated
Value
It returns the recurrence phi-coefficient profile for
state k for all delays considered
Author(s)
Moreno I. Coco (moreno.cocoi@gmail.com)
References
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, 1153-1161. (special issue on recurrence)
See Also
CTcrqa, simts
Examples
## simulate two dichotomous series
tS = simts(0.25, 0.05, 0.2, 0.2, 0.25, 100)
ts1 = tS[1,]; ts2 = tS[2,]
## k = 1, as series are dichotomous
## check data(crqa) for alternative data (RDts1, RDts2)
k = 1; ws = 40
res = calcphi(ts1, ts2, ws, k)