Difference between subset and filter from dplyr

Question

It seems to me that subset and filter (from dplyr) are having the same result. But my question is: is there at some point a potential difference, for ex. speed, data sizes i

Answer 1

Interesting. I was trying to see the difference in terms of the resulting dataset and I coulnd't get an explanation to why the "[" operator behaved differently (i.e., to why it also returned NAs):

# Subset for year=2013
sub<-brfss2013 %>% filter(iyear == "2013")
dim(sub)
#[1] 486088    330
length(which(is.na(sub$iyear))==T)
#[1] 0

sub2<-filter(brfss2013, iyear == "2013")
dim(sub2)
#[1] 486088    330
length(which(is.na(sub2$iyear))==T)
#[1] 0

sub3<-brfss2013[brfss2013$iyear=="2013", ]
dim(sub3)
#[1] 486093    330
length(which(is.na(sub3$iyear))==T)
#[1] 5

sub4<-subset(brfss2013, iyear=="2013")
dim(sub4)
#[1] 486088    330
length(which(is.na(sub4$iyear))==T)
#[1] 0