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OCR: DF records the associated degrees of freedom for each source variation. degree of freedom IS subtracted from the total number of non-missing values for each parameter estimate used in model computation. The computation of the total sample variation (C Total) uses an estimate of the mean, one degree of freedom C subtracted the total. The total degrees of freedom are partitioned into the Model and Error terms For the Model DF k-1 degrees of freedom from the total are use to compute the variation attributed to the analysis of variance model for factor with K levels The Error degrees of freedom are the difference between the tc DF and Model DF computatior