Conference-1989 Studies in Money and Credit
Equation
ρ
x
y
=
Σ
(
x
−
x
¯
)
(
y
−
y
¯
)
√
{
Σ
(
x
−
x
¯
)
2
Σ
(
y
−
y
¯
)
2
}
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