Biology Reference
In-Depth Information
125
2.0
100
1.5
75
1.0
50
0.5
25
0
0.0
−
25
−
0.5
−
50
−
1.0
−
75
−
1.5
−
100
−
125
−
2.0
0
24
48
72
96 120 144 168 192 216
240
0
24
48
72
96 120 144 168 192 216
240
Time (hours)
Time (hours)
FIGURE 11-18.
An example of DTRNDANL applied to the noisy stationary cosine wave originally presented in Figure 11-14, again employing a fixed-period sliding
window detrend that assumes an approximately 24-hour intrinsic periodicity. The panel on the left is the result produced by leaving the data series
being detrended in original data space, whereas the panel on the right is the result produced by processing and converting the data series being detrended to
SND-space.
175
3.0
150
2.5
125
2.0
100
1.5
75
1.0
50
0.5
25
0.0
0
−
0.5
−
25
−
1.0
−
50
−
1.5
−
75
−
2.0
−
100
−
2.5
−
125
−
3.0
0
24
48
72
96 120 144 168 192 216
240
0
24
48
72
96 120 144 168 192 216
240
Time (hours)
Time (hours)
FIGURE 11-19.
An example of DTRNDANL applied to the noisy nonstationary cosine wave originally presented in Figure 11-15. DTRNDANL employs a fixed-period sliding
window detrending algorithm that will perform trend removal assuming good/reasonable prior knowledge of intrinsic periodicity, such as approximately 24
hours in the case of circadian rhythmicity. The panel on the left is the result produced by leaving the data series being detrended in original data space,
whereas the panel on the right is the result produced by processing and converting the data series being detrended to SND-space.
