Maximum likelihood estimation of the structural nested mean model using SAS PROC NLP

Almirall, Daniel; Murphy, Susan A.; Coffman, C J; Yancy Jr, William S. (2010). Maximum likelihood estimation of the structural nested mean model using SAS PROC NLP. In Faries, Douglas E., Leon, Andrew C., Haro, Josep Maria, Obenchain, Robert L. (Ed.), Analysis of observational health care data using SAS.