34
L
+T
?
8
HT
?
f
(
x)dx =
R
b
R
8
?
f
(
x)dx = 1
-
?
f
(
x)dx
(3)
-8
R
dimana:
f(x)
=
probability density function permintaan x selama (T)
•
Jika data berdistribusi normal, maka:
R
=
x
L
+T
+
S
Z
?
1
-
HT
?
?
(3a)
?
b
?
•
Jika data berdistribusi eksponensial, maka:
ln
HT
R
=
b
-
?
L
+T
(3b)
•
Safety Stock:
8
SS =
?
(R - x) f ( x)dx
0
8
8
SS =
R
?
f
(
x)dx -
?
xf ( x)dx =
R
-
x
L
+T
(4)
0
0
 |