Modeling and Multivariate Methods - SAS

108 Fitting Standard Least Squares Models Chapter 3
Effect Options
4. Select age and click Add.
5. Click Run.
Figure 3.42 Least Squares Mean Table
A Least Squares Means table with standard errors is produced for all categorical effects in the model. For
main effects, the Least Squares Means table also includes the sample mean. It is common for the least
squares means to be closer together than the sample means. For further details about least squares means, see
the appendix “Statistical Details” on page 651.
Table 3.12 Description of the Least Squares Means Table
Level
Least Sq Mean
Estimability
Std Error
Lower 95%
Upper 95%
Mean
Lists the names of each categorical level.
Lists the least squares mean for each level of the categorical variable.
Displays a warning if a least squares mean is not estimable. The column only
appears when a message has to be displayed.
Lists the standard error of the least square mean for each level of the
categorical variable.
Note: Only appears if you have the Regression Reports > Show All
Confidence Intervals option selected or if you right-click in the report and
select Columns > Lower 95%.
Lower 95% confidence interval for the mean.
Note: Only appears if you have the Regression Reports > Show All
Confidence Intervals option selected or if you right-click in the report and
select Columns > Upper 95%.
Upper 95% confidence interval for the mean.
Lists the response sample mean for each level of the categorical variable. This
is different from the least squares mean if the values of other effects in the
model do not balance out across this effect.