r - Group data under conditions -

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i working r on cross-section data , having problem when grouping data under conditions. problem can seen small part of huge database following. calculate average (distance) under conditions of same province, district , commune.

province    district    commune  distance 101           15           3      15 101           15           3       5 101           15           3       7 101           15           9       1 101           15           9       7 102           18          19       3 102           18          19       10 103           16          22       5 103           16          22       6

the expected results following (divided each specific commune each district , each province):

province    district    commune    distance 101           15           3       average 101           15           9       average 102           18           19      average 103           16           22      average

try

library(dplyr) df1 %>%      group_by(province, district, commune) %>%      summarise(distance=mean(distance))

or

aggregate(distance~., df1, mean)

or

 library(data.table)  setdt(df1)[, list(distance=mean(distance)), .(province, district, commune)]

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