The REPEATED statement specifies the covariance structure of multivariate responses for GEE model fitting in the GENMOD procedure. In addition, the REPEATED statement controls the iterative fitting algorithm used in GEEs and specifies optional output. Other GENMOD procedure statements, such as the MODEL and CLASS statements, are used in the same way as they are for ordinary generalized linear models to specify the regression model for the mean of the responses.
Table 43.8 summarizes the options available in the REPEATED statement.
Table 43.8: REPEATED Statement Options
Option 
Description 

Specifies initial values for log odds ratio regression parameters 

Specifies the convergence criterion for GEE parameter estimation 

Displays the estimated correlation matrix 

Displays the estimated working correlation matrix 

Displays the estimated covariance matrix 

Displays the estimated empirical correlation matrix 

Displays the estimated empirical covariance matrix 

Specifies initial values of the regression parameters estimation 

Specifies either an initial or a fixed value of the intercept 

Specifies the regression structure of the log odds ratio 

Specifies the maximum number of iterations 

Displays the estimated modelbased correlation matrix 

Displays the estimated modelbased covariance matrix 

Displays an analysis of parameter estimates table 

Displays an analysis of maximum likelihood parameter estimates table 

Specifies the number of iterations between updates of the working correlation matrix 

Groups by subject and sorts within subject 

Specifies a variable defining subclusters 

Identifies a different subject, or cluster 

Specifies the working correlation matrix structure 

Uses the SAS ‘Version 6’ method of computing normalized Pearson chisquare 

Specifies the order of measurements within subjects 

Specifies the pairs of responses 

Specifies the full matrix 

Specifies the rows of the matrix 