Other

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Improved generalized estimating equation analysis via xtqls for implementation of quasi-least squares in Stata (with Sarah J. Ratcliffe and Mary Leonard), UPenn Biostatistics Working Papers (2006)
 

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On The Violation Of Bounds For The Correlation In Generalized Estimating Equation Analyses Of Binary Data From Longitudinal Trials (with Wenguang Sun, Xin Tu, and Jay Amsterdam), UPenn Biostatistics Working Papers (2006)