【单选题】下列资料不适合用Logistic回归分析的是
【简答题】Whales live in the ocean, but they are not fish. They are warm-blooded mammals and must have air to breathe. The babies are born alive and drink milk from the mother's body. It took millions of years ...
【判断题】Do they have many a air-conditioners for cooling the rooms in summer?
【单选题】有研究者对英国35岁以上的开业医生进行吸烟与肺癌的研究,根据研究对象的吸烟情况将其分成不吸烟和每日吸不同支数的几组,追踪4年5个月,收集死亡资料。该研究方法属于
【判断题】在其他条件相同的情况下,煤层埋藏越深,煤层的瓦斯就越多。
【简答题】根据以下资料,回答 135~134 题: 一项以医院为基础的罕见病的病例对照研究,其符合规定的病例数很少且病例的某种构成特殊,不易找到均衡的对照组,但又必须保证研究效率 第 135 题 选择对照的形式为( )
【单选题】Do they have ( ) air-condioners for cooling the room in summer?