Basic Analysis and Graphing - SAS

Chapter 5 Performing Oneway Analysis 139
Means/Anova and Means/Anova/Pooled t
Table 5.4 Description of Report Window Elements
Element
Mean diamonds are added to the
Oneway plot
Reference
See “Display Options” on page 136 and “Mean Diamonds and
X-Axis Proportional” on page 143.
Reports See “The Summary of Fit Report” on page 139.
See “The Analysis of Variance Report” on page 141.
See “The Means for Oneway Anova Report” on page 142.
See “The t-test Report” on page 140.
Note: This report appears only if the Means/Anova/Pooled t
option is selected.
See “The Block Means Report” on page 143.
Note: This report appears only if you have specified a Block
variable in the launch window.
The Summary of Fit Report
The Summary of Fit report shows a summary for a one-way analysis of variance.
The report lists the following quantities:
Table 5.5 Description of the Summary of Fit Report
Rsquare
Adj Rsquare
Root Mean Square Error
Mean of Response
Measures the proportion of the variation accounted for by
fitting means to each factor level. The remaining variation is
attributed to random error. The R 2 value is 1 if fitting the group
means accounts for all the variation with no error. An R 2 of 0
indicates that the fit serves no better as a prediction model than
the overall response mean. For more information, see
“Statistical Details for the Summary of Fit Report” on page 181.
R 2 is also called the coefficient of determination.
Adjusts R 2 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
“Statistical Details for the Summary of Fit Report” on page 181.
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.
Overall mean (arithmetic average) of the response variable.