In fact, we know that monthly cholera occurrences observed over 11 years exhibit a decreasing trend and a strong seasonality with high incidence in July and August [ 4 , 32 , 33 , 34 , 35 , 36 ].
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Assessing Seasonality Variation with Harmonic Regression: Accommodations for Sharp Peaks.
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The sentences
To obtain a sequence of values with an increasing trend and apparent seasonality, the AR and SAR parameters are taken to be 0.6 and 0 respectively.