Puntarika Pornprasit. 2004. A comparison of common risk difference estimators when data are sparse. Field of Study Biostatistics, Mahidol University;
Puntarika Pornprasit. (2004) A comparison of common risk difference estimators when data are sparse . Mahidol University/Bangkok.
Puntarika Pornprasit. A comparison of common risk difference estimators when data are sparse. . Bangkok:Mahidol University, 2004.
Puntarika Pornprasit. (2004) A comparison of common risk difference estimators when data are sparse . Mahidol University/Bangkok.