1226-1227 / 2063
Logistic model of response
P
=
exp(
u
)
1
+
exp(
u
)
u
=
a
0
+
a
1
D
+
a
2
Dd
+
...
u
=
ln
P
1
−
P
"
#
$
%
&
'
With
Logistic
, the inflection (max slope) occurs at
Response =
50%
(
P
= 0.5,
u
= 0)
P
/(1-
P
)
is called the
odds
of the response,
u
is called the
logit
of
P