independent variable=自变量=独立变量=x=predictors
dependent variable=因变量=y=outcome variables
nature of dependent variable
categorical variable=nominal variable:2+类,无内在联系(性别、头发颜色)
ordinal variable:2+类,有内在联系(经济水平-低中高、学历水平-小学中学大学)
interval variable
关系:
统计头发颜色的平均值无意义;计算学历水平平均值无意义;有分类无量化(介于ordinal和interval变量之间,如勉强同意、同意、非常同意,则可以量化为123)
What is the difference between categorical, ordinal and interval variables?
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