The Summary of Fit Report

The Summary of Fit report shows a summary for a one-way analysis of variance.

Measures the proportion of the variation accounted for by fitting means to each factor level. The remaining variation is attributed to random error. The R2 value is 1 if fitting the group means account for all the variation with no error. An R2 of 0 indicates that the fit serves no better as a prediction model than the overall response mean. For more information, see Summary of Fit Report.

R2 is also called the coefficient of determination.

Note: A low RSquare value suggests that there may be variables not in the model that account for the unexplained variation. However, if your data are subject to a large amount of inherent variation, even a useful ANOVA model may have a low RSquare value. Read the literature in your research area to learn about typical RSquare values.

Adj Rsquare

Adjusts R2 to make it more comparable over models with different numbers of parameters by using the degrees of freedom in its computation. For more information, see Summary of Fit Report.

Root Mean Square Error

Estimates the standard deviation of the random error. It is the square root of the mean square for Error found in the Analysis of Variance report.

Mean of Response

Overall mean (arithmetic average) of the response variable.

Observations (or Sum Wgts)

Number of observations used in estimating the fit. If weights are used, this is the sum of the weights. See Summary of Fit Report.