ids2rownum takes a vector of ids and converts it to the right row number in the dataset; ids should be unique in the dataset that is, don't pass the function panel data with multiple same ids
Examples
ids <- seq(1, 1000, length.out = 100)
ids <- ids[order(runif(100))]
df <- data.frame(id = ids)
ids2rownum(df$id, df, "id")
#> [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
#> [19] 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
#> [37] 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
#> [55] 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
#> [73] 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
#> [91] 91 92 93 94 95 96 97 98 99 100