Table showing the correspondence between the two state id variables. This is an empirical tab taken from the 1977 data (which has both). x7| x9 ------------+------------------------------------ 11 | 13 12 | 13 13 | 13 14 | 11 15 | 13 16 | 12 21 | 21 22 | 22 23 | 23 31 | 31 32 | 32 33 | 33 34 | 34 35 | 35 41 | 43 42 | 41 43 | 42 44 | 43 45 | 43 46 | 43 47 | 43 51 | 56 52 | 56 53 | 51 54 | 52 55 | 56 56 | 53 57 | 56 58 | 54 59 | 55 61 | 61 62 | 62 63 | 62 64 | 62 71 | 73 72 | 71 73 | 73 74 | 72 81 | 81 82 | 81 83 | 81 84 | 81 85 | 81 86 | 81 87 | 81 88 | 81 91 | 93 92 | 93 93 | 91 94 | 93 95 | 92