问题描述
我需要一些有关逻辑回归编码因子的帮助.
I need some help with coding factors for a logistic regression.
我有六个代表收入等级的虚拟变量.我想将这些转换为单个有序因子以用于逻辑回归.
What I have are six dummy variables representing income brackets. I want to convert these into a single ordered factor for use in a logistic regression.
我的数据框看起来像:
INC1 INC2 INC3 INC4 INC5 INC6
1 0 0 1 0 0 0
2 NA NA NA NA NA NA
3 0 0 0 0 0 1
4 0 0 0 0 0 1
5 0 0 1 0 0 0
6 0 0 0 1 0 0
7 0 0 1 0 0 0
8 0 0 0 1 0 0
我想要的样子:
INC
1 INC3
2 NA
3 INC6
4 INC6
5 INC3
6 INC4
7 INC3
8 INC4
这一定是一个常见(且简单)的操作，但我的搜索没有找到关于如何执行此重新编码的简明答案.很感谢任何形式的帮助.
This must be a common (and simple) operation, but my searches have not turned up a concise answer for how to perform this re-coding. Any help is very much appreciated.
推荐答案
这是基于另一个答案的解决方案，该答案保留 NA 值并转换为有序因子.
Here's a solution based on another answer that keeps the NA values and converts to an ordered factor.
> inc
INC1 INC2 INC3 INC4 INC5 INC6
1 0 0 1 0 0 0
2 NA NA NA NA NA NA
3 0 0 0 0 0 1
4 0 0 0 0 0 1
5 0 0 1 0 0 0
6 0 0 0 1 0 0
7 0 0 1 0 0 0
8 0 0 0 1 0 0
> inc$F = factor(apply(inc, 1, function(x) names(x)[x == 1]),levels=names(inc),ordered=TRUE)
> inc
INC1 INC2 INC3 INC4 INC5 INC6 F
1 0 0 1 0 0 0 INC3
2 NA NA NA NA NA NA <NA>
3 0 0 0 0 0 1 INC6
4 0 0 0 0 0 1 INC6
5 0 0 1 0 0 0 INC3
6 0 0 0 1 0 0 INC4
7 0 0 1 0 0 0 INC3
8 0 0 0 1 0 0 INC4
> inc$F
[1] INC3 <NA> INC6 INC6 INC3 INC4 INC3 INC4
Levels: INC1 < INC2 < INC3 < INC4 < INC5 < INC6
如果您连续有多个 1，这将中断.
This will break if you have more than one 1 in a row.
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