Spectral analysis of coffee, maize and wheat production in Kenya
Masaya, Tichaendepi R.
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Spectral methods are applied to coffee, maize, and wheat production series. Coffee and wheat spectra reveal two cycles each. For coffee, most spectral power is concentrated at a frequency corresponding to a 2.4 year cycle. A second coffee cycle has a period of about 4.6 years. Similarly, wheat has 5 year and 2.9 year cycles. Maize has one cycle lasting for a period of 2.8 years.