Biology Reference
In-Depth Information
FIGURE 11-23.
FFT-NLLS analysis of the noisy nonstationary cosine wave originally presented in Figure 11-15.
In this instance, FFT-NLLS identified four rhythmic components that were considered statistically
significant at 95% confidence. The results of this analysis produce, as a circadian rhythm estimate,
a rhythmic component exhibiting (1) an estimated oscillatory amplitude of 29.4 5.4 y-axis units
(RAE of 0.183); (2) the estimated period is 23.41 0.31 hours; and (3) the estimated phase is 1.92
0.68 hours.
