Other Important Random Variables - Random Signals and Processes Primer with MATLAB - page 352

σ 1 =0.2 σ 2=0.1< σ 1

a

5 4

3.5

4

3

3

2.5

2

2

1 1.5

0 200 400 600 0 200 400 600

n n

σ 3=0.08< σ 2 σ 4=0.05< σ 3

3.5 3.2

3

3

2.8

2.6

2.5

2.4

2 2.2

0 200 400 600 0 200 400 600

n n

b

σ 1=0.2 σ 2=0.1< σ 1

0.8 1.5

0.6

1

0.4

0.5

0.2

0 0

0 2 4 6 2 2.5 3 3.5 4

Range Range

σ 3=0.08< σ 2 σ 4=0.05< σ 3

2 3

1.5

2

1

1

0.5

0

0

2 2.5 3 3.5 2 2.5 3 3.5

Range Range

Fig. 5.25 Illustration of the second case. ( a ) Lognormal variables. ( b ) Densities