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（變動系數）增加至2 0 %時，周期型種群變爲不穩定型。
Methods Dummy variable is introduced into the linear regression equation to correct cyclical variation and reduce error of forecasting.
方法在線性廻歸方程中引用啞變量，脩正周期性變化，降低預測的誤差。
The result shows that the bichem value has a cyclical fluctuation that is closely related to menstrual cycle and the variation is obvious.
研究結果表明：運動員的血紅蛋白值呈周期性波動，這種波動與月經周期有密切聯系，波動的差值有顯著性差異；