An asymptotic theory for the nonparametric maximum likelihood estimator in the Cox gene model

1 President's Laboratory, National Health Research Institutes, 35 Keyan Road, Zhunan Town, Miaoli County 350, Taiwan. E-mail: ischang@nhri.org. tw 2Division of Biostatistics and Bioinformatics, National Health Research Institutes, 35 Keyan Road, Zhunan Town, Miaoli County 350, Taiwan. E-Mail: *hsiung@nhri.org.tw; * *wenqz@nhri. org. tw 3Department of Mathematics and Science Education, Taipei Municipal Teachers College, Taipei, Taiwan. E-mail: wmei@maill.tmtc.edu.tw