Coefficient of Variation =
20
.25
Coefficient of Variation =
LEGEND
Gamma Distribution
Lognormal Distribution
Gamma Distribution
-_Lognormal Distribution
Density Function
134
2
o
e&
2
a
104
=
a
c
&
0
**]
0
64
54
00
oO
Y
os
T
1
—
1s
”
2
X Value
7
265
T
3
35
X Value
Coefficient of Variation = 1.00
12
Coefficient of Variation = 1.50
40
remem
X Value
Fig. 1.
————~ Gamme Distribution
atte tree
normal Distribution
354
Density Function
Density Function
——— Gamma Distribution
304
N
e
. 779
10
0
os
1
18
2
X Value
25
Comparison of gamma and lognormal probability density
3
functions with expected value of unity and four values
of the coefficient of variation.
35