上面是内置数据集Titanic的外在属性,现进行如下操作:
b. Return an array that retains the Class, Sex and Age dimensions of Titanic where each element contains the proportion of survivors for the given Class by Sex by Age group.
大意就是,返回列名为“舱的等级”、“性别”、“年龄”的值,其中包含每一等舱幸存者的比例,按年龄、性别分组(可能翻译有错误),目前刚开始学习R,好多都没接触过,求大侠指教