删除dplyr管道中的NA

Question

我试图使用dplyr管道从子集中删除NA。我的答案是错过了一个步骤。我想学习如何使用dplyr写功能：

> outcome.df%>% 
+ group_by(Hospital,State)%>% 
+ arrange(desc(HeartAttackDeath,na.rm=TRUE))%>% 
+ head() 
Source: local data frame [6 x 5] 
Groups: Hospital, State 

 
          Hospital State HeartAttackDeath 
1  ABBEVILLE AREA MEDICAL CENTER SC    NA 
2  ABBEVILLE GENERAL HOSPITAL LA    NA 
3  ABBOTT NORTHWESTERN HOSPITAL MN    12.3 
4 ABILENE REGIONAL MEDICAL CENTER TX    17.2 
5  ABINGTON MEMORIAL HOSPITAL PA    14.3 
6 ABRAHAM LINCOLN MEMORIAL HOSPITAL IL    NA 
Variables not shown: HeartFailureDeath (dbl), PneumoniaDeath 
    (dbl) 

Answer 1

我不认为desc需要一个na.rm说法......实际上，我惊奇地发现这不会引发错误，当您给它一个。如果你只是想删除NA S，使用na.omit：

outcome.df %>% 
    na.omit() %>% 
    group_by(Hospital, State) %>% 
    arrange(desc(HeartAttackDeath)) %>% 
    head() 

如果只想从HeartAttackDeath列中删除NA S，滤波器is.na：

outcome.df %>% 
    filter(!is.na(HeartAttackDeath)) %>% 
    group_by(Hospital, State) %>% 
    arrange(desc(HeartAttackDeath)) %>% 
    head() 

正如指出的欺骗， complete.cases也可以使用，但是放入链中有点麻烦，因为它将数据帧作为参数，但返回索引向量。所以你可以这样使用它：

outcome.df %>% 
    filter(complete.cases(.)) %>% 
    group_by(Hospital, State) %>% 
    arrange(desc(HeartAttackDeath)) %>% 
    head()