indexing - R delete rows in data frame where nrow of index is smaller than certain value -

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i want delete rows in data frame when number of rows same index smaller pre-specified value.

> fof.6.5[1:15, 1:3]    draw fund.id firm.id 1     1    1667     666 2     1    1572     622 3     1    1392     553 4     1     248      80 5     1    3223     332 6     2    2959    1998 7     2    2659    1561 8     2   14233    2517 9     2   10521   12579 10    2    3742    1045 11    3    9093   10121 12    3   15681   21626 13    3   26371   70170 14    4   27633   52720 15    4   13751     656

in example, want each index have 5 rows. third draw (which index) has fewer 5 rows. how can delete draws third 1 if have fewer 5 rows?

you using dplyr (assuming data in data frame called dt:

dt %>% group_by(draw) %>% filter(n() >= 5) %>% ungroup()

or use table or xtabs:

tab <- xtabs(~ draw, dt)  dt[!dt$draw %in% as.numeric(names(which(tab < 5))), ]

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