循环以创建虚拟变量 R

Question

我想制作一个带有虚拟变量的数据框，当事件发生时间在一个时间范围（小时）之间时显示 1。这就是我做的：

library(chron)
library(stringr)

var <- c("A", "B", "C", "D", "E", "F")
times <- c("22:40:20", "10:36:29", "09:23:27", "12:33:27", "12:22:22", "00:17:44")

df <- data.frame(var, times)
hours <- print(paste(stringr::str_pad(c(0:23), 2, side="left", pad=0),
                     "00", "00", sep=":"))

hours <- chron(times=hours)
df$times <- chron(times=df$times)

df$zero <- 0
df$zero[df$times>=hours[1] & df$times<hours[2]] <- 1
df$one <- 0
df$one[(df$times>=hours[2] & df$times<hours[3])] <- 1

依此类推，直到：

df$twentytree <- 0
df$twentytree[(df$times>=hours[24] ] <- 1

  var    times zero one
1   A 22:40:20    0   0
2   B 10:36:29    0   0
3   C 09:23:27    1   0 # in column zero is one because the time event is between 00:00:00 and 01:00:00
4   D 12:33:27    0   0
5   E 12:22:22    0   0
6   F 00:17:44    1   0

但我很确定那一定是其他一些自动化方式想法？

提前致谢。

p.d: 这个方法我试过了，还是不行

df <- cbind(df, sapply(hours, function(x) as.integer(c4$times >=x & c4$times<x) ) )

Answer 1

我相信这是一个使用 lubridate 和 model.matrix 的解决方案。您需要重命名列。

> library(lubridate)
> 
> var <- c("A", "B", "C", "D", "E", "F")
> times <- c("22:40:20", "10:36:29", "09:23:27", "12:33:27", "12:22:22", "00:17:44")
> 
> df <- data.frame(var, times)
> 
> df$times <- hms(df$times)
> df$hour <- hour(df$times)
> indicators <- model.matrix(~ -1 + factor(df$hour))
> df <- cbind(df, indicators)
> df
  var       times hour factor(df$hour)0 factor(df$hour)9 factor(df$hour)10 factor(df$hour)12 factor(df$hour)22
1   A 22H 40M 20S   22                0                0                 0                 0                 1
2   B 10H 36M 29S   10                0                0                 1                 0                 0
3   C  9H 23M 27S    9                0                1                 0                 0                 0
4   D 12H 33M 27S   12                0                0                 0                 1                 0
5   E 12H 22M 22S   12                0                0                 0                 1                 0
6   F     17M 44S    0                1                0                 0                 0                 0

Answer 2

最后我什至不需要转换为日期。我是这样理解的：

library(stringr)

var <- c("A", "B", "C", "D", "E", "F")
times <- c("22:40:20", "10:36:29", "09:23:27", "12:33:27", "12:22:22", "00:17:44")

df <- data.frame(var, times)

hours <- stringr::str_pad(c(0:23), 2, side="left", pad=0)
df$hour <- substr(df$times,1,2)

df <- cbind(df, sapply(hours, function(x) as.integer(df$hour==x) ) )

结果：

 var    times hour 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
1   A 22:40:20   22  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
2   B 10:36:29   10  0  0  0  0  0  0  0  0  0  0  1  0  0  0  0  0  0  0  0  0  0  0
3   C 09:23:27   09  0  0  0  0  0  0  0  0  0  1  0  0  0  0  0  0  0  0  0  0  0  0
4   D 12:33:27   12  0  0  0  0  0  0  0  0  0  0  0  0  1  0  0  0  0  0  0  0  0  0
5   E 12:22:22   12  0  0  0  0  0  0  0  0  0  0  0  0  1  0  0  0  0  0  0  0  0  0
6   F 00:17:44   00  1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0

循环以创建虚拟变量 R

looping in order to create dummy variables R

r

chron