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形如Y=αX~β∈这样的模型,其平均预估值的百分偏倚近似式是×100,式中是ln∈的估计方差。用×100来估计无偏预估值百分率的标准误差。这两个式是关于X值域的常数。
For a model of the form Y = αX ~ β∈, the approximate percentage bias of the average predicted value is × 100, where is the estimated variance of ln ∈. Use × 100 to estimate the standard error of unbiased estimates. The two formulas are constants for the X range.