47
 a) Stair Data Representation and 2nd Derivative Data, Samplel



 10 1
 9 0.8
 8 Dt-0.6
 S7 .-_ % 0.4
 6 0.2
 5- 0



 2 Stair Data -0.6
 1 e 2nd Derivative -0.8
 0 -1
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
 Time (Sec)


 b) Stair Data Representation and 2nd Derivative Data, Sample 2



 10 1
 9 f0.8
 8 0.6
 7 0.4
 6" 0.2
 5 0
 4- 4-0.2
 o 3 Stair Data -0.4
 2 2nd Derivative -0.6
 1 -0.8
 0 -1
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
 Time (sec)


 c) Stair Data Representation and 2nd Derivative Data, Sample 3


 10 1
 9 -- 0.8
 8- 0.6
 7 W -, 0.4
 6 0.2
 5 5 a% Wo .

 4 -0.2
 3 W- O -0.4
 2 Stair Data -0.6
 1 -0.8
 1 2nd Derivative
 0 -1
 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
 Time (sec)


Figure 4-3: Stair-counter data: a) sample 1, b) sample 2, c) sample 3