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Table 3 Evaluation of the two criteria for each metric

From: Metrics for describing dyadic movement: a review

Metric

Criterion

 

C1: Practical use

C2: Dependence on parameters / assumptions

 

Attainable range

Interpretation for joint movement

Sensitivity to

 
   

P

C Direction

C Speed

 

Prox

Yes

From always distant (0) to always close (1)

High

Low

Low

User tractable (ad hoc definition of distance threshold)

Cs

No

Difficult: i) negative value close to 0 difficult to interpret; ii) series-length dependent

Medium

Medium

Low

Not user tractable (null hypothesis of independent movement)

HAI

Yes

From always distant and out of SAB at least for one individual (0) to always close and in SAB (1)

Low

Low

Medium

Not user tractable (reference area and distance threshold)

L ixn T

Yes

Same as HAI

Low

Low

Medium

Not user tractable (reference area)

j P P A

Yes

From no (0) to permanent (1) potential overlap

High

Low

Low

User tractable (maximum velocity)

C S E M

Yes

From highly synchronous (0) to asynchronous (1)

High

Low

Low

User tractable (distance threshold)

r V

Yes

From anticorrelated (-1) to correlated (1)

Low

High*

High*

No dependence

D I d

Yes

From opposite (-1) to cohesive (1) movement in displacement

Low

Low

High

User tractable (weighting coefficient for similarity in displacement)

D I θ

Yes

From opposite (-1) to cohesive (1) movement in azimuth

Low

High

Low

No dependence

DI

Yes

From opposite (-1) to cohesive (1) movement in both mixed displacement and azimuth effects

Low

High

Low

User tractable (weighting coefficient for similarity in displacement)

  1. Note: P =Proximity, Cspeed= coordination in speed, Cdirection= coordination in direction, S = reference area. *Depending on v (see section on case scenarios). Text in bold correspond to positive attributes