Prevosti et al's (1975) distance [Takezaki, N. 96] has a statistical property similar to that of Dr and is defined as
Cp
=
∑
j
r
∑
i
m
j
x
ij
−
y
ij
2r
Cp = {sum _j ^r sum _i ^{m_j} abs{x_ij - y_ij}} over 2r