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余弦模型是周期性回归模型[1]的一种，和圆分布分析法一样，常用于高峰时间的估计，但余弦模型还能拟合出曲线的期望值。目前文献[1,2]所报道的余弦模型算法较为复杂，不具备一定的数学知识就较为困难；文献所见余弦模型不同的表达式也易使人混淆。我们提出一种极简便的非线性?
The cosine model is one of the periodic regression models [1], which, like the circular distribution analysis, is commonly used for the estimation of peak times, but the cosine model also fits the expectation of the curve. The cosine model algorithms reported by the current literature [1, 2] are more complex and do not possess some mathematical knowledge. It is also difficult to confuse cosine models with different expressions. We propose a very simple and non-linear?