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Bulletin – June 2014
Equation
Δ
s
a
v
i
n
g
r
a
t
i
o
¯
21
=
X
¯
2
′
β
^
2
−
X
¯
1
′
β
^
1
=
X
¯
1
′
(
β
^
2
−
β
^
1
)
+
(
X
¯
2
′
−
X
¯
1
′
)
β
^
2
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