Table 1 Metrics for measuring dyad joint movement

\(Prox = K_{\delta }^{+}/T\)

[0, 1]

i) δ: distance threshold, ii) K : kernel

\(Cs = \frac { D_{chance} - \left (\sum _{t=1}^{T} d_{t}^{A,B} \right)/T}{D_{chance} + \left (\sum _{t=1}^{T} d_{t}^{A,B} \right)/T} \)

]−1,1]

D_chance definition

\(HAI = \frac {K_{\delta }^{+}}{K_{\delta }^{+} + (n_{A0} + n_{0B})/2}\)

[0,1]

i) Reference area, ii) δ: distance threshold

\(L_{ixn}T = \text {logistic}\left (\ln {\left (\frac {n_{AB}/p_{AB} + n_{00}/p_{00}}{n_{A0}/p_{A0} + n_{0B}/p_{0B} }\right)}\right)\)

[0, 1]

Reference area;

\(jPPA = \frac {S\left \{ \bigcup \limits _{t=1}^{T-1} \left (E_{\phi ^{A}}\left (X_{t}^{A},X_{t+1}^{A}\right) \cap E_{\phi ^{B}}\left (X_{t}^{B},X_{t+1}^{B}\right) \right) \right \}}{S\left \{ \bigcup \limits _{t=1}^{T-1} \left (E_{\phi ^{A}}\left (X_{t}^{A},X_{t+1}^{A}\right) \cup E_{\phi ^{B}}\left (X_{t}^{B},X_{t+1}^{B}\right) \right) \right \}}\)

[0, 1]

i) Every zone within ellipse has same odd of being transited, ii) ϕ: maximum velocity

\(CSEM = \frac {\max \left \{m; N_{m} >0\right \} }{T-1}\)

[0, 1]

distance threshold

\(r_{V} = \frac {\sum _{t=1}^{T}\left (V^{A}_{t} - \bar {V}^{A}\right)\left (V^{B}_{t} - \bar {V}^{B}\right)}{\sqrt {\sum _{t=1}^{T}\left (V^{A}_{t} - \bar {V}^{A}\right)^{2}}\sqrt {\sum _{t=1}^{T}\left (V^{B}_{t} - \bar {V}^{B}\right)^{2}}}\)

[-1, 1]

\(DI_{d} = \left (\sum _{t=1}^{T-1} \left [1 - \left (\frac {\mid d_{t,t+1}^{A}-d_{t,t+1}^{B}\mid }{d_{t,t+1}^{A}+d_{t,t+1}^{B}}\right)^{\beta }\right ]\right)/(T-1)\)

[0, 1]

β: scaling parameter

\(DI_{\theta } = \left (\sum _{t=1}^{T-1} \cos \left (\theta _{t,t+1}^{A} - \theta _{t,t+1}^{B}\right)\right)/(T-1)\)

[-1, 1]

\(DI = \frac {\sum _{t=1}^{T-1} \cos (\theta _{t,t+1}^{A} - \theta _{t,t+1}^{B})\left [1 - \left (\frac {\mid d_{t,t+1}^{A}-d_{t,t+1}^{B}\mid }{d_{t,t+1}^{A}+d_{t,t+1}^{B}}\right)^{\beta }\right ]}{T-1}\)

[-1, 1]

β: scaling parameter