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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
/(1-
P
)
is called the
odds
of the response,
u
is called the
logit
of
P