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Example sentences for: fft-nlls

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Finally, the pitfall of FFT-NLLS is that the curve-fitting operation associated with a probing sinusoid is sensitive to the presence of other periodicities in the data, variations in wave form from cycle to cycle, and random noise.
One further method of period estimation needs to be mentioned, as we and others have used it in the past [ 10 18 ] . It is called Fast Fourier Transform - Non Linear Least Squares analysis (FFT-NLLS).
We discuss alternative methods for evaluating the period of behavioral rhythms as well as rhythms in the luciferase assay, including a method used in earlier studies called FFT-NLLS [ 10 18 ] .