Biomedical Engineering Reference
In-Depth Information
TABLE 8.1:
Mean Squared Values of the Segments
N
=
20. Significance
Level:
α
=
0
.
05
x
1
x
6
x
11
x
16
5.5
5.7
6.8
5.4
x
2
5.1
(7)
5.0
(12)
6.6
(17)
6.8
(3)
5.7
(8)
6.5
(13)
4.9
(18)
5.8
(4)
5.2
(9)
5.4
(14)
5.4
(19)
6.9
(5)
4.8
(10)
5.8
(15)
5.9
(20)
5.5
Let us look at an example where the random data are from a sample record of
480 seconds in duration. The sample record is divided into 20 segments of equal lengths
or 24 seconds of durations with the mean squared values shown in Table 8.1.
8.1.2.2
Median = 5.6
Hence, mean squared values greater than the median value will be designated a (
+
) and
those values less than the median will be designated as (
−
).
x
i
≥
5
.
6
=+
x
i
<
5
.
6
=−
Result
−
1
2
−
3
4
5
6
7
±±±
−
9
10 11
±±±
13
8
12
r
=
13 runs are represented by the sequence of 20 observations.
2
for
α
=
0
.
05
or
=
0
.
025
From Runs Distribution, (Table 8.2),
−
2
r
10
;1
=
r
10
:0
.
975
=
6
r
10
;
2
=
r
10
:0
.
025
=
15
Then,
r
10
:0
.
975
=
6
<
r
=
13
<
r
10
:0
.
025
=
15
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