University of Maryland

100 100
75 75
50 50
poor discrimination
good discrimination
b
p
25 25
0
0
-150
-150
-137.5
-137.5 -125
-125
-112.5
-112.5
-100
-100
-87.5
-87.5
-75
-75
-62.5
-62.5
-50
-50
-37.5
-37.5
-25
-25
-12.5
-12.5
00
12.5 12.5
25 25
37.5 37.5
50 50
62.5 62.5
75 75
87.5 87.5
100 100
112.5 112.5
125 125
137.5 137.5
150
150
-150 -100 -50 0 50 100 150
100 100
75 75
50 50
25 25
good discrimination
good discrimination
b
p
ph
0
0
-150 -100 -50 0 50 100 150
Lisker & Abramson (1964, 1970)
25