摘要:nehurdle is a command to estimate models where the dependent variable has a corner solution at 0 (see[阅读全文]

摘要:该研究是将传统的病例对照研究和队列研究的一些要素进行组合后形成的一种研究方法，兼具二者的优点。可分为前瞻性和回顾性两类。[阅读全文]

摘要:Most diseases are likely to result largely from the interplay of lifestyle and genetic factors. Howev[阅读全文]