Number of missing values in each column in R [duplicate]

Answer 1

You can do this with sapply

library(titanic)
data(titanic_train)
sapply(titanic_train, function(x) sum(is.na(x)))
PassengerId    Survived      Pclass        Name         Sex         Age 
          0           0           0           0           0         177 
      SibSp       Parch      Ticket        Fare       Cabin    Embarked 
          0           0           0           0           0           0 

Answer 2

If I'm not mistaken, sapply is not vectorized. Can use colSums and is.na directly

>>> colSums(is.na(titanic_train))