[英]Recoding time series data to create time 0 for each individual
I'm trying to recode some data collected every 2h such that I find the start point for each ID (ie when obs does not equal zero, ie there is data for that time point), call it time 0 and then for each subsequent time point is called 2, 4, 6 etc. 我正在尝试重新编码每2小时收集的一些数据,这样我就能找到每个ID的起始点(即,当obs不等于零时,即该时间点有数据),将其称为时间0,然后是每个后续时间点被称为2,4,6等
For eg 例如
ID <- c("f1", "f1", "f1", "f1", "f2", "f2", "f2", "f2", "f3", "f3", "f3", "f3")
time <- rep(c(66, 68, 70, 72), 3)
obs <- c(1, 3, 5, 6, 0, 0, 3, 4, 0, 1, 3, 3)
new.time <- c(0, 2, 4, 6, NA, NA, 0, 2, NA, 0, 2, 4)
data <- as.data.frame(cbind(ID, time, obs, new.time))
Hopefully that data frame works 希望数据框架有效
i have ID, time and obs but I want to create 'new time' -- any help appreciated, particularly a dplyr solution 我有身份证,时间和视力,但我想创造'新时间' - 任何帮助,尤其是dplyr解决方案
1) We define data
as a data.frame rather than a matrix in the Note at the end and then use ave
to set the new.time
: 1)我们将
data
定义为data.frame而不是最后的Note中的矩阵,然后使用ave
来设置new.time
:
No packagtes are used. 没有使用包装。
make_no <- function(obs) c(rep(NA, sum(obs == 0)), seq(0, length = sum(obs != 0), by = 2))
transform(data, new.time = ave(obs, ID, FUN = make_no))
giving: 赠送:
ID time obs new.time
1 f1 66 1 0
2 f1 68 3 2
3 f1 70 5 4
4 f1 72 6 6
5 f2 66 0 NA
6 f2 68 0 NA
7 f2 70 3 0
8 f2 72 4 2
9 f3 66 0 NA
10 f3 68 1 0
11 f3 70 3 2
12 f3 72 3 4
2) or using dplyr: 2)或使用dplyr:
data %>%
group_by(ID) %>%
mutate(new.time = make_no(obs)) %>%
ungroup
ID <- c("f1", "f1", "f1", "f1", "f2", "f2", "f2", "f2", "f3", "f3", "f3", "f3")
time <- rep(c(66, 68, 70, 72), 3)
obs <- c(1, 3, 5, 6, 0, 0, 3, 4, 0, 1, 3, 3)
data <- data.frame(ID, time, obs)
We can create a custom function and apply it per group, ie 我们可以创建一个自定义函数并按组应用它,即
f1 <- function(x) {
x1 <- length(x[x != 0])
i1 <- seq(0, length.out = x1, by = 2)
i2 <- c(rep(NA, (length(x) - x1)),i1)
return(i2)
}
#Using `dplyr` to apply it,
library(dplyr)
df %>%
group_by(ID) %>%
mutate(new = f1(obs))
which gives, 这使,
# A tibble: 12 x 4 # Groups: ID [3] ID time obs new <fct> <fct> <fct> <dbl> 1 f1 66 1 0 2 f1 68 3 2 3 f1 70 5 4 4 f1 72 6 6 5 f2 66 0 NA 6 f2 68 0 NA 7 f2 70 3 0 8 f2 72 4 2 9 f3 66 0 NA 10 f3 68 1 0 11 f3 70 3 2 12 f3 72 3 4
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