The RELIABILITY Procedure

LSMEANS Statement

LSMEANS <model-effects> </ options> ;

The LSMEANS statement computes and 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 16.19 summarizes the options available in the LSMEANS statement.

Table 16.19: LSMEANS Statement Options

Option

Description

Construction and Computation of LS-Means

AT in SAS/STAT User's Guide

Modifies the covariate value in computing LS-means

BYLEVEL in SAS/STAT User's Guide

Computes separate margins

DIFF in SAS/STAT User's Guide

Requests differences of LS-means

OM= in SAS/STAT User's Guide

Specifies the weighting scheme for LS-means computation as determined by the input data set

SINGULAR= in SAS/STAT User's Guide

Tunes estimability checking

Degrees of Freedom and p-values

ADJUST= in SAS/STAT User's Guide

Determines the method for multiple-comparison adjustment of LS-means differences

ALPHA= in SAS/STAT User's Guide$\alpha $

Determines the confidence level ($1-\alpha $)

STEPDOWN in SAS/STAT User's Guide

Adjusts multiple-comparison p-values further in a step-down fashion

Statistical Output

CL in SAS/STAT User's Guide

Constructs confidence limits for means and mean differences

CORR in SAS/STAT User's Guide

Displays the correlation matrix of LS-means

COV in SAS/STAT User's Guide

Displays the covariance matrix of LS-means

E in SAS/STAT User's Guide

Prints the $\mb {L}$ matrix

LINES in SAS/STAT User's Guide

Produces a Lines display for pairwise LS-means differences

MEANS in SAS/STAT User's Guide

Prints the LS-means

PLOTS= in SAS/STAT User's Guide

Requests graphs of means and mean comparisons

SEED= in SAS/STAT User's Guide

Specifies the seed for computations that depend on random numbers


For details about the syntax of the LSMEANS statement, see the section LSMEANS Statement in SAS/STAT User's Guide in Chapter 19: Shared Concepts and Topics in SAS/STAT User's Guide.