Summary statistics for natl1977 dataset : by Jean Roth , jroth@nber.org , 3 Jan 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- datayear | 2,772,206 7 0 7 7 shipnum | 0 reparea | 0 rectype | 2,772,206 1.228036 .4195658 1 2 restatus | 2,772,206 1.258063 .5051488 1 4 -------------+--------------------------------------------------------- stateres | 0 cntyres | 0 cityres | 0 citrspop | 0 smsares | 0 -------------+--------------------------------------------------------- metrores | 0 divres | 2,772,206 4.752472 2.330821 0 9 stsubres | 2,772,206 50.90251 23.71161 0 95 statenat | 0 cntynat | 0 -------------+--------------------------------------------------------- divocc | 2,772,206 4.767534 2.322491 1 9 stsubocc | 2,772,206 51.05446 23.61911 11 95 csex | 2,772,206 1.48719 .499836 1 2 birattnd | 2,772,206 1.029163 .2640128 1 4 frace | 2,772,206 2.024095 2.489486 0 9 -------------+--------------------------------------------------------- mrace | 2,772,206 1.26018 .8025926 0 9 crace | 2,772,206 1.262133 .7649552 0 8 crace3 | 2,772,206 1.355552 .7492844 1 3 dmage | 2,772,206 24.67558 5.25403 10 49 mage36 | 2,772,206 11.67633 5.25241 1 36 -------------+--------------------------------------------------------- mage15 | 2,772,206 11.76423 3.385618 1 17 mage12 | 2,772,206 8.300838 1.579285 1 13 mage8 | 2,772,206 3.534452 1.088807 1 8 mage7 | 2,772,206 3.534047 1.087328 1 7 mage6 | 2,772,206 2.537517 1.080811 1 6 -------------+--------------------------------------------------------- nlbnl | 2,772,206 2.228221 9.064177 0 99 nlbnd | 2,772,206 4.067422 15.73967 0 99 nlbd | 2,772,206 3.176149 14.02761 0 99 dtotord | 2,772,206 3.126936 9.467338 1 99 totord9 | 2,772,206 2.262014 1.548253 1 9 -------------+--------------------------------------------------------- dlivord | 2,772,206 2.910222 9.225379 1 99 livord9 | 2,772,206 2.094546 1.422977 1 9 livord8 | 2,772,206 2.072351 1.333404 1 8 livord7 | 2,772,206 2.055875 1.270396 1 7 livord6 | 2,772,206 2.022638 1.168745 1 6 -------------+--------------------------------------------------------- livord3 | 2,772,206 1.590895 .5095391 1 3 dfage | 2,772,206 36.36272 23.79614 10 99 fage11 | 2,772,206 4.985826 2.50655 1 11 dbirwt | 2,772,206 3336.111 656.0282 227 9999 birwt12 | 2,772,206 7.155579 1.234139 1 12 -------------+--------------------------------------------------------- birwt3 | 2,772,206 1.930601 .2609074 1 3 dplural | 2,772,206 1.019692 .1414378 1 5 plural3 | 2,772,206 1.019681 .1412403 1 3 plural2 | 2,772,206 1.019354 .1377642 1 2 birmon | 2,772,206 6.563484 3.418025 1 12 -------------+--------------------------------------------------------- birday | 2,772,206 15.72814 8.790677 1 99 lmpmon | 2,772,206 24.59743 34.34795 1 99 lmpday | 2,772,206 41.99001 37.7533 1 99 lmpyr | 0 dgestat | 2,772,206 41.77647 29.37171 0 99 -------------+--------------------------------------------------------- gestat10 | 2,772,206 6.051619 3.293821 0 10 gestat3 | 2,772,206 1.73063 .9449516 0 3 dmeduc | 2,772,206 26.63082 30.06573 0 99 meduc14 | 2,772,206 6.843568 3.786737 0 14 meduc6 | 2,772,206 2.599753 1.552141 0 6 -------------+--------------------------------------------------------- dfeduc | 2,772,206 36.2772 36.55702 0 99 feduc14 | 2,772,206 7.854621 4.498943 0 14 dlegit | 2,772,206 3.774235 3.340303 1 9 legit3 | 2,772,206 .7190476 .631024 0 2 monprec | 0 -------------+--------------------------------------------------------- mpre10 | 2,772,206 2.234423 2.159537 0 10 mpre6 | 2,772,206 1.847195 1.278817 0 6 llbmon | 2,772,206 48.51457 37.80481 1 99 llbyr | 2,772,206 78.05851 6.781955 37 99 disllb | 2,772,206 480.0883 391.8759 0 999 -------------+--------------------------------------------------------- isllb17 | 2,772,206 5.630287 6.756441 0 21 isllb10 | 2,772,206 2.902151 3.41227 0 10 isllb8 | 2,772,206 2.347818 2.723026 0 8 lfdmon | 2,772,206 74.73252 20.31302 1 99 lfdyr | 2,772,206 78.93855 5.286075 1 99 -------------+--------------------------------------------------------- dlfd | 2,772,206 752.3704 211.1252 0 999 dterm | 2,772,206 487.7486 401.0557 0 999 term9 | 2,772,206 2.984759 3.299013 0 9 outcome | 2,772,206 .6421651 .7580998 0 3 mplbir | 2,772,206 29.79973 15.81382 1 99 -------------+--------------------------------------------------------- nprevis | 2,772,206 34.26047 36.57114 0 99 legitstrflg | 2,772,206 .6209167 .485159 0 1 educstrflg | 2,772,206 .8241812 .380666 0 1 lmprflg | 2,772,206 .811659 .3909843 0 1 monprerflg | 2,772,206 .9228109 .2668913 0 1 -------------+--------------------------------------------------------- llbrflg | 2,772,206 .8163019 .3872379 0 1 lfdrflg | 2,772,206 .8163019 .3872379 0 1 legitsmsar~g | 2,772,206 .3443766 .4751647 0 1 educsmsarflg | 2,772,206 .5122812 .4998492 0 1 congenrflg | 2,772,206 .9189472 .2729162 0 1 -------------+--------------------------------------------------------- nprevisrflg | 2,772,206 .7270596 .4454705 0 1 injuryrflg | 2,772,206 .7376822 .4398946 0 1 legitstoflg | 2,772,206 .6209611 .4851479 0 1 educstoflg | 2,772,206 .8253413 .379675 0 1 lmpoflg | 2,772,206 .8133746 .3896106 0 1 -------------+--------------------------------------------------------- monpreoflg | 2,772,206 .9263666 .2611734 0 1 llboflg | 2,772,206 .8173307 .3863953 0 1 lfdoflg | 2,772,206 .8173307 .3863953 0 1 congenflg | 2,772,206 .9219816 .2682005 0 1 nprevisoflg | 2,772,206 .7288914 .4445321 0 1 -------------+--------------------------------------------------------- injuryoflg | 2,772,206 .7393379 .4389959 0 1 attend | 2,772,206 1.097311 .7888559 1 9 recwt | 2,772,206 1.201988 .4014836 1 2 nprev28 | 2,772,206 8.699645 6.829236 0 28 by Jean Roth , jroth@nber.org , 3 Jan 2016