# Statistics for Environmental Engineers

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The variance of the log-transformed values in Table 7.5 is О)2(y) = 0.549. This cannot be compared directly with the variance from, for instance, a square root transformation unless the calculations are normalized to keep them on the same relative scale. The denominator of the Box-Cox transformation, Xyg , is a normalizing factor to make the variances comparable across different

TABLE 7.5