[英]dummy variables to single categorical variable (factor) in R
I have a set of variables coded as binomial. 我有一组编码为二项式的变量。
Pre VALUE_1 VALUE_2 VALUE_3 VALUE_4 VALUE_5 VALUE_6 VALUE_7 VALUE_8
1 1 0 0 0 0 0 1 0 0
2 1 0 0 0 0 1 0 0 0
3 1 0 0 0 0 1 0 0 0
4 1 0 0 0 0 1 0 0 0
I would like to merge the variables (VALUE_1, VALUE_2...VALUE_8) into one single ordered factor, while conserving the column (Pre) as is, duch that the data would look like this: 我想将变量(VALUE_1,VALUE_2 ... VALUE_8)合并为一个单独的有序因子,同时保留列(Pre),因为数据看起来像这样:
Pre VALUE
1 1 VALUE_6
2 1 VALUE_5
3 1 VALUE_5
Or even better: 甚至更好:
Pre VALUE
1 1 6
2 1 5
3 1 5
I am aware that this exists: Recoding dummy variable to ordered factor 我知道这存在:将虚拟变量重新编码为有序因子
But when I try the code used in that post, I receive the following error: 但是,当我尝试该帖子中使用的代码时,我收到以下错误:
PA2$Factor = factor(apply(PA2, 1, function(x) which(x == 1)), labels = colnames(PA2))
Error in sort.list(y) : 'x' must be atomic for 'sort.list'
Have you called 'sort' on a list?
Any help would be appreciated 任何帮助,将不胜感激
A quick solution would be something like 一个快速的解决方案就是这样的
Res <- cbind(df[1], VALUE = factor(max.col(df[-1]), ordered = TRUE))
Res
# Pre VALUE
# 1 1 6
# 2 1 5
# 3 1 5
# 4 1 5
str(Res)
# 'data.frame': 4 obs. of 2 variables:
# $ Pre : int 1 1 1 1
# $ VALUE: Ord.factor w/ 2 levels "5"<"6": 2 1 1 1
OR if you want the actual names of the columns (as Pointed by @BondedDust), you can use the same methodology to extract them 或者如果你想要列的实际名称(由@BondedDust指出),你可以使用相同的方法来提取它们
factor(names(df)[1 + max.col(df[-1])], ordered = TRUE)
# [1] VALUE_6 VALUE_5 VALUE_5 VALUE_5
# Levels: VALUE_5 < VALUE_6
OR you can use your own which
strategy in the following way (btw, which
is vectorized so no need in using apply
with a margin of 1 on it) 或者您可以使用自己的which
策略以下列方式(顺便说一句, which
是矢量所以在使用无需apply
与1就可以了保证金)
cbind(df[1], VALUE = factor(which(df[-1] == 1, arr.ind = TRUE)[, 2], ordered = TRUE))
OR you can do matrix
multiplication (contributed by @akrun) 或者你可以做matrix
乘法(由@akrun提供)
cbind(df[1], VALUE = factor(as.matrix(df[-1]) %*% seq_along(df[-1]), ordered = TRUE))
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