Frequency domain analysis refers to analysis where a signal is studied with respect to frequency, rather than with respect to time. The data being studied is plotted with the frequency on the x axis and the amplitude on the y axis; this shows how the signal’s energy is distributed as a function of frequency.
Stephanie Glen. "Frequency Domain: Definition" From StatisticsHowTo.com: Elementary Statistics for the rest of us! https://www.statisticshowto.com/frequency-domain/
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