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An example of sas programming code for inputting and analyzing car fuel efficiency (mpg) data using the mixed procedure. The data is organized by driver and car, and the analysis includes type 3 analysis of variance and covariance parameter estimates to determine the significance of driver, car, and driver-car interaction on mpg. The sas output displays the results.
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The^ SAS
System
The^ Mixed ProcedureType 3 Analysis
of^ VarianceSum^ of
Source
Squares
Mean Square
driver
car^
driver*car
Residual
Type^ 3 Analysis
of^ Variance
Error
Source
Expected
Mean Square
Error^ Term^
Value
driver
Var(Residual) +
2 Var(driver*car)
MS(driver*car)
+^10 Var(driver) car^
Var(Residual) +
2 Var(driver*car)
MS(driver*car)
+^ 8 Var(car) driver*car
Var(Residual) +
2 Var(driver*car)
MS(Residual)
Residual
Var(Residual)
Type^ 3 Analysisof^ VarianceSource^
Pr >^ F driver
car^
driver*car
Residual