如何根据特定列的级别查找第一次出现的 NA答案

【问题标题】：How to find the first occurance of NAs based on the levels of a specific column如何根据特定列的级别查找第一次出现的 NA
【发布时间】：2022-11-15 07:51:50
【问题描述】：

我有这些数据：

X1<-c(1.1,0.2,0.4,0.8,1.3,2.3,1.1,3.2,NA,0.8,2.1,NA,1.1,0.2,0.4,0.8,NA,0.6)
X2<-c(0.8,NA,1.2,0.3,NA,NA,0.8,NA,1.5,2.7,2.2,NA,0.8,3.1,1.7,0.3,1.1,2.4)
Time<-c("baseline","week1","week2","week3","week4","week5","baseline","week1","week2","week3","week4","week5","baseline","week1","week2","week3","week4","week5")
data<-data.frame(X1,X2,Time)

我想找出第一个NA发生在X1和X2的时间点

我这样做了，但它没有给出我想要的正确输出：

data %>%
group_by (Time)
filter (is.na(X1)) %>%
slice (1) %>%
ungroup ()

例如，我想要的 X1 是这样的输出：

Time    
Week 2

谁能伸出援手？

【问题讨论】：

你的代码有什么问题？
@onyambu 当我在我的实际数据上尝试时，它会在我的每个时间点前给我一个 NA 列表

标签： r dplyr statistics missing-data

【解决方案1】：

尝试这个：

data %>% apply(2, function(x) which(is.na(x))[1])

【讨论】：

谢谢，但根据我的真实数据，这段代码为我提供了所有变量的列表，每个变量下面都有一些数字。它没有告诉我第一次 NA 发生在我的欲望变量的哪个时间点