cyclical variation

基本解释

When the white noise level(coefficient of variation) increases to 20%, the cyclical fish population becomes spasmodic.
在白色噪音水平（变动系数）增加至2 0 %时，周期型种群变为不稳定型。
Methods Dummy variable is introduced into the linear regression equation to correct cyclical variation and reduce error of forecasting.
方法在线性回归方程中引用哑变量，修正周期性变化，降低预测的误差。
The result shows that the bichem value has a cyclical fluctuation that is closely related to menstrual cycle and the variation is obvious.
研究结果表明：运动员的血红蛋白值呈周期性波动，这种波动与月经周期有密切联系，波动的差值有显著性差异；