I am trying to filter out at random row from my df if a condition has been satisfied, e.g. if freq.x >3

    Site freq.x freq.y

1 B001A 1 1 2 B002A 2 2 3 B003A 1 1 4 B004A 1 1 5 BTNR-001A 1 1 6 BTNR-002A 1 1 7 BTNR-003A 2 2 8 BTNR-004A 1 1 9 BTNR-005A 1 1 10 BTNR-006A 2 2 11 BTNR-007A 1 1 12 BTNR-008A 2 2 13 BTNR-009A 2 2 14 BTNR-010A 2 2 15 BTNR-011B 2 2 16 BTNR-012A 3 3 17 BTNR-013A 1 1 18 BTNR-014A 1 1 19 BTNR-016A 1 1 20 BTNR-017A 2 2 21 BTNR-018A 1 1 22 BTNR-020A 1 1 23 BTNR-021A 2 2 24 BTNR-022A 2 2 25 BTNR-023A 2 2 26 BTNR-024A 1 1 27 BTNR-025A 1 1 28 BTNR-026A 2 2 29 BTNR-027A 1 1 30 BTNR-028A 2 2 31 BTNR-029A 2 2 32 BTNR-030A 1 1 33 BTNR-031A 1 1 34 BTNR-032A 1 1 35 BTNR-033A 1 1 36 BTNR-034A 1 1 37 BTNR-035A 2 2 38 BTNR-037A 1 1 39 BTNR-038A 1 1 40 BTNR-043A 1 1 41 BTNR-046A 2 2 42 BTNR-061A 1 1 43 CCNR-081A 1 1 44 CCNR-082A 1 1 45 CCNR-083A 1 1 46 CCNR-084A 2 2 47 CCNR-086A 1 1 48 CCNR-087A 3 3 49 CCNR-088A 2 2 50 CCNR-089A 1 1 51 CCNR-090A 2 2 52 CCNR-091A 3 3 53 CCNR-092A 2 2 54 CCNR-093A 2 2 55 CCNR-095A 3 3 56 CCNR-096A 1 1 57 CCNR-097A 3 3 58 CCNR-099A 2 2 59 CCNR-100A 3 3 60 CCNR-101A 1 1 61 CCNR-102A 3 3 62 CCNR-103A 3 3 63 CCNR-104A 1 1 64 CCNR-105A 3 3 65 CCNR-106A 2 2 66 CCNR-107A 1 1 67 CCNR-109A 1 1 68 CCNR-110A 1 1 69 CCNR-111A 3 3 70 CCNR-113A 3 3 71 CCNR-114A 2 2 72 CCNR-115A 2 2 73 CCNR-116A 1 1 74 CCNR-125A 1 1 75 CCNR-141A 2 2 76 CCNR-149A 3 3 77 CCNR085A 2 2 78 CCNR094A 1 1 79 CCNR108A 1 1 80 EC-003A 2 2 81 J001A 1 1 82 J002A 1 1 83 JB001A 1 1 84 JB003A 3 3