The PHREG Procedure
LSMEANS Statement
LSMEANS <model-effects> </ options>;
The LSMEANS statement compares least squares means (LS-means) of fixed effects. LS-means are predicted population margins—that is, they estimate the marginal means over a balanced population. In a sense, LS-means are to unbalanced designs as class and subclass arithmetic means are to balanced designs.
Table 87.8 summarizes the options available in the LSMEANS statement. If the BAYES statement is specified, the ADJUST=, STEPDOWN, and LINES options are ignored. The PLOTS= option is not available for the maximum likelihood analysis. It is available only for the Bayesian analysis.
Table 87.8: LSMEANS Statement Options
Option | Description |
|---|---|
Construction and Computation of LS-Means | |
Modifies the covariate value in computing LS-means | |
Computes separate margins | |
Requests differences of LS-means | |
Specifies the weighting scheme for LS-means computation as determined by the input data set | |
Tunes estimability checking | |
Degrees of Freedom and p-values | |
Determines the method for multiple-comparison adjustment of LS-means differences | |
Adjusts multiple-comparison p-values further in a step-down fashion | |
Statistical Output | |
Constructs confidence limits for means and mean differences | |
Displays the correlation matrix of LS-means | |
Displays the covariance matrix of LS-means | |
Uses connecting lines to indicate nonsignificantly different subsets of LS-means | |
Displays the results of the LINES option as a table | |
Prints the LS-means | |
Requests graphs of means and mean comparisons | |
Specifies the seed for computations that depend on random numbers | |
Generalized Linear Modeling | |
Exponentiates and displays estimates of LS-means or LS-means differences | |
Computes and displays estimates and standard errors of LS-means (but not differences) on the inverse linked scale | |
Reports (simple) differences of least squares means in terms of odds ratios if permitted by the link function | |
For details about the syntax of the LSMEANS statement, see the section LSMEANS Statement in Chapter 19: Shared Concepts and Topics.