@article{dru93com, title = {Comment on {{Regression}} Models for Discrete Longitudinal Responses by {{G}}. {{M}}. {{Fitzmaurice}}, {{N}}. {{M}}. {{Laird}}, and {{A}}. {{G}}. {{Rotnitzky}}}, volume = {8}, journal = {Stat Sci}, author = {Drum, Melinda and McCullagh, Peter}, year = {1993}, keywords = {maximum-likelihood,huber-sandwich-estimator,robust-variance-estimation}, pages = {300-301}, citeulike-article-id = {13264020}, posted-at = {2014-07-14 14:09:27}, priority = {0} }