Choosing an appropriate number of factors in factor analysis with incomplete data. - Juwon Song; Thomas R. Belin (Comput. Stat. Data Anal., 2008)

Score tests for zero-inflation and overdispersion in two-level count data. - Hwa Kyung Lim; Juwon Song; Byoung Cheol Jung (Comput. Stat. Data Anal., 2013)