With regression analysis, a mathematics model of both simple linear and multiple linear regressions were established.

利用回归分析法，建立一元线性回归处理的数学模型和多元线性回归处理的数学模型。

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Linear model is a vital class of statistical model which involves regression model, variance analysis model, covariance analysis model and mixed model etc.

线性模型是一类很重要的统计模型，它包括回归模型、方差分析模型、协方差分析模型以及混合模型等。

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Finally, a linear model is established to forecast diurnal NEE through variance analysis and multiple linear regression methods.

最后，利用方差分析和多元线性回归方法建立了预报日nee的线性模型。

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Important cases where the computational definition of R2 can yield negative values, depending on the definition used, arise where the predictions which are being compared to the corresponding outcomes have not been derived from a model-fitting procedure using those data, and where linear regression is conducted without including an intercept.

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