We provide the rationale for the existence of yes-men and no-men in an organization or a group. On one hand, a person is inclined to conform to the instruction of another, because he cannot ignore the information contained in the instruction, even though his own evidence contradicts the...

This article develops parametric and semi-parametric, maximum likelihood estimation methods of the proportional hazard model for the case when durations are grouped and heterogeneity is not fully measured. This article also extends Ryu’s (1994b) specification tests for the proportional hazard...

This paper establishes monotonicity of the chi-square test statistic. As the more efficient parameter estimator is plugged into the test statistic, the degrees of freedom of the resulting chi-square test statistic monotonically increase. -- cell ; chi-square test ; Fisher information ;...