Discriminant Analysis - Statpower

We can use the regression formula (5) to classify
scores, i.e., attempt to categorize them into groups.
A score y ˆi classified as being in the group whose
predicted score mean is closest to it. Since the
group means are
βˆ′ ( x − x ) and ˆ′ ( − )
the midpoint, or cutpoint, is
1
( ) ˆ ( )
β x x (6)
βˆ′ x1− x + β′
x2 − x
ˆ ⎛ x1+
x
′
2
= β −
⎞
⎜ x ⎟ (7)
2 ⎝ 2 ⎠
2