%0 Journal Article %T Extensions of the Penalized Spline of Propensity Prediction Method of Imputation %A Zhang, Guangyu %A Little, Roderick %J Biometrics %V 65 %N 3 %@ 0006-341X %D 2009-09-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve