subset data frame based on percentage

Question

i have a data frame that contains a data like this :

V1 V2 V3
1  2  0.34
1  3  0.31
1  4  0.12
1  5  0.12

the data frame is bigger but that

Answer 1

The subset() function is handy because (among other benefits) it allows you to avoid having to repeatedly mention the name of the data-frame:

subset(dataFrame, V3 <= quantile(V3, 0.2))