Summary statistics for namcs2007 dataset : by Jean Roth , jroth@nber.org , 28 Mar 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- vmonth | 32,778 6.416438 3.388556 1 12 vyear | 32,778 2006.986 .1192586 2006 2007 vdayr | 32,778 3.889285 1.410836 1 7 age | 32,778 46.442 24.77017 0 100 sex | 32,778 1.424126 .4942171 1 2 -------------+--------------------------------------------------------- ethun | 32,778 -1.714565 5.104293 -9 2 raceun | 32,778 -1.915218 4.777923 -9 6 paypriv | 32,778 .5967722 .4905532 0 1 paymcare | 32,778 .2540423 .4353282 0 1 paymcaid | 32,778 .1393313 .3462972 0 1 -------------+--------------------------------------------------------- paywkcmp | 32,778 .0103118 .1010236 0 1 payself | 32,778 .0712673 .2572748 0 1 paynochg | 32,778 .0086338 .0925179 0 1 payoth | 32,778 .0340167 .1812749 0 1 paydk | 32,778 .029532 .1692948 0 1 -------------+--------------------------------------------------------- paytype | 32,778 1.578803 2.485538 -9 7 usetobac | 32,778 -2.301727 4.517072 -9 2 injdet | 32,778 4.661755 1.122522 -9 5 injury | 32,778 .1007078 .300946 0 1 rfv1 | 32,778 27436.83 15330.86 -9 89990 -------------+--------------------------------------------------------- rfv2 | 32,778 8448.719 13992.07 -9 89990 rfv3 | 32,778 2815.634 8667.147 -9 89990 rfv13d | 32,778 2743.655 1533.095 0 8999 rfv23d | 32,778 845.4249 1398.854 0 8999 rfv33d | 32,778 282.3364 866.4509 0 8999 -------------+--------------------------------------------------------- primcare | 32,778 .9902068 2.459768 -9 2 refer | 32,778 -2.794435 4.532987 -9 2 senbefor | 32,778 1.159772 .3663999 1 2 pastvis | 32,778 2.945329 8.268273 -7 99 major | 32,778 2.237324 2.098781 -9 5 -------------+--------------------------------------------------------- diag1 | 0 diag2 | 0 diag3 | 0 diag13d | 0 diag23d | 0 -------------+--------------------------------------------------------- diag33d | 0 prdiag1 | 32,778 1.90936 .8495032 -7 2 prdiag2 | 32,778 -2.253066 4.484072 -7 2 prdiag3 | 32,778 -4.659955 3.942627 -7 2 arthrtis | 32,778 .1179755 .322584 0 1 -------------+--------------------------------------------------------- asthma | 32,778 .0528708 .223779 0 1 cancer | 32,778 .0914028 .2881854 0 1 castage | 32,778 -6.686375 1.723743 -8 3 cebvd | 32,778 .0192507 .1374071 0 1 chf | 32,778 .0183355 .1341634 0 1 -------------+--------------------------------------------------------- crf | 32,778 .0094881 .096945 0 1 copd | 32,778 .0309659 .1732279 0 1 deprn | 32,778 .0946366 .2927169 0 1 diabetes | 32,778 .1048874 .306413 0 1 hyplipid | 32,778 .1246263 .3302997 0 1 -------------+--------------------------------------------------------- htn | 32,778 .238178 .4259751 0 1 ihd | 32,778 .0499725 .2178916 0 1 obesity | 32,778 .0613216 .239923 0 1 ostprsis | 32,778 .0192202 .1373003 0 1 nochron | 32,778 .4976204 .5639481 0 2 -------------+--------------------------------------------------------- totchron | 32,778 .7269815 2.228762 -9 10 dmp | 32,778 -5.691104 3.826704 -9 3 htin | 32,778 20.51409 35.78753 -9 78 wtlb | 32,778 100.4307 96.47232 -9 500 bmi | 32,778 4.589996 18.18126 -9 82.01 -------------+--------------------------------------------------------- tempf | 32,778 319.7143 465.9366 -9 1099 bpsys | 32,778 66.35155 67.73572 -9 260 bpdias | 32,778 38.09924 42.94756 -9 998 diagscrn | 32,778 .890994 .3459819 0 2 breast | 32,778 .0509488 .2198966 0 1 -------------+--------------------------------------------------------- pelvic | 32,778 .053542 .2251151 0 1 rectal | 32,778 .0283117 .1658643 0 1 skin | 32,778 .129233 .3354628 0 1 depress | 32,778 .0126609 .1118079 0 1 anyimage | 32,778 .1507414 .357802 0 1 -------------+--------------------------------------------------------- xray | 32,778 .0530234 .2240835 0 1 bonedens | 32,778 .0042712 .0652154 0 1 catscan | 32,778 .0196168 .1386816 0 1 echocard | 32,778 .0154372 .1232856 0 1 othultra | 32,778 .0271219 .1624409 0 1 -------------+--------------------------------------------------------- mammo | 32,778 .0171151 .1297024 0 1 mri | 32,778 .02041 .1414004 0 1 petscan | 32,778 .0026237 .0511557 0 1 othimage | 32,778 .0124169 .1107387 0 1 cbc | 32,778 .1162975 .3205862 0 1 -------------+--------------------------------------------------------- electrol | 32,778 .0414302 .1992862 0 1 glucose | 32,778 .0517115 .2214474 0 1 hgba | 32,778 .0263286 .1601131 0 1 cholest | 32,778 .0614437 .240146 0 1 psa | 32,778 .0213253 .1444685 0 1 -------------+--------------------------------------------------------- otherbld | 32,778 .1083044 .3107691 0 1 scopproc | 32,778 .0229422 .1497216 0 1 scopewi1 | 0 scopewi2 | 0 scpwi13d | 0 -------------+--------------------------------------------------------- scpwi23d | 0 scpwi12d | 0 scpwi22d | 0 sigcolon | 32,778 .0068949 .0827499 0 1 biopsy | 32,778 .0179999 .1329527 0 1 -------------+--------------------------------------------------------- biopsywi | 0 chlamyd | 32,778 .0052779 .0724585 0 1 papconv | 32,778 .0068644 .0825678 0 1 papliq | 32,778 .0138508 .1168731 0 1 papunsp | 32,778 .0062542 .078837 0 1 -------------+--------------------------------------------------------- pregtest | 32,778 .0041186 .0640451 0 1 hpvdna | 32,778 .0021356 .0461637 0 1 ekg | 32,778 .0273964 .1632381 0 1 spiro | 32,778 .0039966 .063093 0 1 urine | 32,778 .0762097 .2653373 0 1 -------------+--------------------------------------------------------- othdiag | 32,778 .1742327 .3793153 0 1 diagsc1 | 0 diagsc2 | 0 digsc13d | 0 digsc23d | 0 -------------+--------------------------------------------------------- digsc12d | 0 digsc22d | 0 httake | 32,778 .4148514 .4927039 0 1 wttake | 32,778 .6539752 .4757085 0 1 temptake | 32,778 .3323571 .4710654 0 1 -------------+--------------------------------------------------------- blodpres | 32,778 .5640369 .4958899 0 1 totdiag | 32,778 3.123772 2.725969 -9 17 healthed | 32,778 .3968821 .545514 0 2 asthmaed | 32,778 .0092745 .0958581 0 1 dietnutr | 32,778 .1105315 .3135558 0 1 -------------+--------------------------------------------------------- exercise | 32,778 .0759961 .2649959 0 1 grwthdev | 32,778 .0276405 .163943 0 1 injprev | 32,778 .0227287 .1490394 0 1 stresmgt | 32,778 .0259015 .1588439 0 1 tobaced | 32,778 .0279761 .1649068 0 1 -------------+--------------------------------------------------------- wtreduc | 32,778 .0326744 .1777856 0 1 othlthed | 32,778 .1839343 .3874366 0 1 tothlted | 32,778 .2547135 1.835872 -9 8 nonmed | 32,778 .2906523 .5520739 0 2 cam | 32,778 .0080237 .0892162 0 1 -------------+--------------------------------------------------------- dme | 32,778 .0058881 .0765089 0 1 homehlth | 32,778 .0021661 .0464915 0 1 hospice | 32,778 .0003356 .0183163 0 1 pt | 32,778 .0194643 .1381521 0 1 radther | 32,778 .0023491 .0484117 0 1 -------------+--------------------------------------------------------- spocther | 32,778 .0018305 .0427458 0 1 psychoth | 32,778 .0255354 .157747 0 1 othmntl | 32,778 .0140033 .1175058 0 1 excision | 32,778 .0266337 .1610129 0 1 ortho | 32,778 .0169626 .1291332 0 1 -------------+--------------------------------------------------------- wound | 32,778 .0198609 .1395243 0 1 othproc | 32,778 .1080603 .3104613 0 1 othproc1 | 0 othproc2 | 0 othproc3 | 0 -------------+--------------------------------------------------------- othproc4 | 0 othpr13d | 0 othpr23d | 0 othpr33d | 0 othpr43d | 0 -------------+--------------------------------------------------------- othpr12d | 0 othpr22d | 0 othpr32d | 0 othpr42d | 0 totnonmed | 32,778 -.2127647 2.06674 -9 5 -------------+--------------------------------------------------------- med | 32,778 .7560864 .4763341 0 2 med1str | 0 med1 | 32,778 33972.3 40629.75 -9 99999 med2str | 0 med2 | 32,778 23711.31 37410.33 -9 99999 -------------+--------------------------------------------------------- med3str | 0 med3 | 32,778 16771.53 33436.21 -9 99999 med4str | 0 med4 | 32,778 12165.35 29449.91 -9 99999 med5str | 0 -------------+--------------------------------------------------------- med5 | 32,778 9068.235 26005.11 -9 99999 med6str | 0 med6 | 32,778 6815.376 22912.87 -9 99999 med7str | 0 med7 | 32,778 5048.528 19975.22 -9 99999 -------------+--------------------------------------------------------- med8str | 0 med8 | 32,778 3621.276 17023.86 -9 99999 ncmed1 | 32,778 -1.172372 4.119082 -9 2 ncmed2 | 32,778 -3.017847 4.402724 -9 2 ncmed3 | 32,778 -4.204649 4.140577 -9 2 -------------+--------------------------------------------------------- ncmed4 | 32,778 -4.9514 3.765649 -9 2 ncmed5 | 32,778 -5.460797 3.390151 -9 2 ncmed6 | 32,778 -5.83553 3.023872 -9 2 ncmed7 | 32,778 -6.134236 2.659062 -9 2 ncmed8 | 32,778 -6.389011 2.269624 -9 2 -------------+--------------------------------------------------------- numnew | 32,778 .5438404 .971848 0 8 numcont | 32,778 1.629996 2.378991 0 8 nummed | 32,778 2.2671 2.440371 0 8 noprovid | 32,778 .0058576 .0763116 0 1 phys | 32,778 .9670816 .1784258 0 1 -------------+--------------------------------------------------------- physasst | 32,778 .0327659 .178026 0 1 npnmw | 32,778 .014644 .1201248 0 1 rnlpn | 32,778 .2744219 .4462293 0 1 mhp | 32,778 .0042406 .064983 0 1 othprov | 32,778 .1155348 .3196711 0 1 -------------+--------------------------------------------------------- nodisp | 32,778 .0134541 .1152108 0 1 nofu | 32,778 .0490878 .2160547 0 1 retprn | 32,778 .2221917 .4157257 0 1 refothmd | 32,778 .0734029 .2608007 0 1 retappt | 32,778 .7074867 .4549237 0 1 -------------+--------------------------------------------------------- telephon | 32,778 .016444 .1271772 0 1 refered | 32,778 .0016474 .0405559 0 1 admithos | 32,778 .0048508 .0694797 0 1 othdisp | 32,778 .0106169 .1024914 0 1 timemd | 32,778 20.27219 13.92394 0 240 -------------+--------------------------------------------------------- patwt | 32,778 30335.02 26501.34 41 125613 region | 32,778 2.622552 1.010248 1 4 msa | 32,778 1.126853 .3328137 1 2 spec | 0 mddo | 32,778 1.069193 .2537855 1 2 -------------+--------------------------------------------------------- phycode | 32,778 2173.55 1832.805 11 7022 patcode | 32,778 14.82122 9.971672 1 66 bdatefl | 32,778 .0213253 .1444685 0 1 sexfl | 32,778 .0079016 .0885406 0 1 ethnicfl | 32,778 .328513 .4696796 0 1 -------------+--------------------------------------------------------- racefl | 32,778 .3095369 .4623098 0 1 senbefl | 32,778 .0199524 .1398389 0 1 pastfl | 32,778 .0986637 .2982146 0 1 timemdfl | 32,778 .2776252 .4478343 0 1 drugid1 | 0 -------------+--------------------------------------------------------- prescr1 | 23,391 1.15134 .4384402 1 3 contsub1 | 23,391 5.800393 .8351777 2 7 comstat1 | 23,391 1.148903 .3569603 1 3 rx1cat1 | 0 rx1cat2 | 0 -------------+--------------------------------------------------------- rx1cat3 | 0 rx1cat4 | 0 rx1v1c1 | 0 rx1v1c2 | 0 rx1v1c3 | 0 -------------+--------------------------------------------------------- rx1v1c4 | 0 rx1v2c1 | 0 rx1v2c2 | 0 rx1v2c3 | 0 rx1v2c4 | 0 -------------+--------------------------------------------------------- rx1v3c1 | 0 rx1v3c2 | 0 rx1v3c3 | 0 rx1v3c4 | 0 drugid2 | 0 -------------+--------------------------------------------------------- prescr2 | 15,796 1.146999 .4313357 1 3 contsub2 | 15,796 5.798747 .7950948 2 7 comstat2 | 15,796 1.114649 .3194022 1 3 rx2cat1 | 0 rx2cat2 | 0 -------------+--------------------------------------------------------- rx2cat3 | 0 rx2cat4 | 0 rx2v1c1 | 0 rx2v1c2 | 0 rx2v1c3 | 0 -------------+--------------------------------------------------------- rx2v1c4 | 0 rx2v2c1 | 0 rx2v2c2 | 0 rx2v2c3 | 0 rx2v2c4 | 0 -------------+--------------------------------------------------------- rx2v3c1 | 0 rx2v3c2 | 0 rx2v3c3 | 0 rx2v3c4 | 0 drugid3 | 0 -------------+--------------------------------------------------------- prescr3 | 10,967 1.132853 .4203289 1 4 contsub3 | 10,967 5.814079 .7542152 1 7 comstat3 | 10,967 1.101577 .3030098 1 3 rx3cat1 | 0 rx3cat2 | 0 -------------+--------------------------------------------------------- rx3cat3 | 0 rx3cat4 | 0 rx3v1c1 | 0 rx3v1c2 | 0 rx3v1c3 | 0 -------------+--------------------------------------------------------- rx3v1c4 | 0 rx3v2c1 | 0 rx3v2c2 | 0 rx3v2c3 | 0 rx3v2c4 | 0 -------------+--------------------------------------------------------- rx3v3c1 | 0 rx3v3c2 | 0 rx3v3c3 | 0 rx3v3c4 | 0 drugid4 | 0 -------------+--------------------------------------------------------- prescr4 | 7,970 1.138143 .4243357 1 3 contsub4 | 7,970 5.83601 .7024923 2 7 comstat4 | 7,970 1.088708 .2852204 1 3 rx4cat1 | 0 rx4cat2 | 0 -------------+--------------------------------------------------------- rx4cat3 | 0 rx4cat4 | 0 rx4v1c1 | 0 rx4v1c2 | 0 rx4v1c3 | 0 -------------+--------------------------------------------------------- rx4v1c4 | 0 rx4v2c1 | 0 rx4v2c2 | 0 rx4v2c3 | 0 rx4v2c4 | 0 -------------+--------------------------------------------------------- rx4v3c1 | 0 rx4v3c2 | 0 rx4v3c3 | 0 rx4v3c4 | 0 drugid5 | 0 -------------+--------------------------------------------------------- prescr5 | 5,979 1.144506 .4395828 1 3 contsub5 | 5,979 5.859676 .6532811 2 7 comstat5 | 5,979 1.083124 .2773022 1 3 rx5cat1 | 0 rx5cat2 | 0 -------------+--------------------------------------------------------- rx5cat3 | 0 rx5cat4 | 0 rx5v1c1 | 0 rx5v1c2 | 0 rx5v1c3 | 0 -------------+--------------------------------------------------------- rx5v1c4 | 0 rx5v2c1 | 0 rx5v2c2 | 0 rx5v2c3 | 0 rx5v2c4 | 0 -------------+--------------------------------------------------------- rx5v3c1 | 0 rx5v3c2 | 0 rx5v3c3 | 0 rx5v3c4 | 0 drugid6 | 0 -------------+--------------------------------------------------------- prescr6 | 4,495 1.153504 .443035 1 3 contsub6 | 4,495 5.846941 .69851 2 7 comstat6 | 4,495 1.089655 .2872723 1 3 rx6cat1 | 0 rx6cat2 | 0 -------------+--------------------------------------------------------- rx6cat3 | 0 rx6cat4 | 0 rx6v1c1 | 0 rx6v1c2 | 0 rx6v1c3 | 0 -------------+--------------------------------------------------------- rx6v1c4 | 0 rx6v2c1 | 0 rx6v2c2 | 0 rx6v2c3 | 0 rx6v2c4 | 0 -------------+--------------------------------------------------------- rx6v3c1 | 0 rx6v3c2 | 0 rx6v3c3 | 0 rx6v3c4 | 0 drugid7 | 0 -------------+--------------------------------------------------------- prescr7 | 3,342 1.144225 .4246532 1 3 contsub7 | 3,342 5.83842 .690888 2 7 comstat7 | 3,342 1.079593 .2718061 1 3 rx7cat1 | 0 rx7cat2 | 0 -------------+--------------------------------------------------------- rx7cat3 | 0 rx7cat4 | 0 rx7v1c1 | 0 rx7v1c2 | 0 rx7v1c3 | 0 -------------+--------------------------------------------------------- rx7v1c4 | 0 rx7v2c1 | 0 rx7v2c2 | 0 rx7v2c3 | 0 rx7v2c4 | 0 -------------+--------------------------------------------------------- rx7v3c1 | 0 rx7v3c2 | 0 rx7v3c3 | 0 rx7v3c4 | 0 drugid8 | 0 -------------+--------------------------------------------------------- prescr8 | 2,371 1.154787 .4473047 1 3 contsub8 | 2,371 5.841417 .7003233 2 7 comstat8 | 2,371 1.088992 .2877401 1 3 rx8cat1 | 0 rx8cat2 | 0 -------------+--------------------------------------------------------- rx8cat3 | 0 rx8cat4 | 0 rx8v1c1 | 0 rx8v1c2 | 0 rx8v1c3 | 0 -------------+--------------------------------------------------------- rx8v1c4 | 0 rx8v2c1 | 0 rx8v2c2 | 0 rx8v2c3 | 0 rx8v2c4 | 0 -------------+--------------------------------------------------------- rx8v3c1 | 0 rx8v3c2 | 0 rx8v3c3 | 0 rx8v3c4 | 0 retypoff | 32,778 1.494905 1.224373 1 8 -------------+--------------------------------------------------------- solo | 32,778 1.727714 .4451432 1 2 empstat | 32,778 1.400726 .5523365 1 3 owns | 32,778 1.730581 1.522805 -9 7 lab | 32,778 1.457502 .6779604 -9 2 pateven | 32,778 1.693148 .608632 -9 2 -------------+--------------------------------------------------------- nhvisr | 32,778 -.2343645 1.68551 -9 1 homvisr | 32,778 -.2964183 1.702049 -9 1 hosvisr | 32,778 -.0274574 2.41312 -9 1 telconr | 32,778 -.1855818 2.443729 -9 1 econr | 32,778 -.4343157 2.092829 -9 1 -------------+--------------------------------------------------------- ebillrec | 32,778 1.060345 2.13978 -9 3 emedrec | 32,778 2.389865 .9740338 -8 3 edemog | 32,778 1.035939 1.321005 -9 4 eprolst | 32,778 -1.796998 4.532086 -9 4 ecpoe | 32,778 1.541125 1.465294 -9 4 -------------+--------------------------------------------------------- ewarn | 32,778 -5.043993 3.613731 -9 4 escrip | 32,778 -5.027213 3.757515 -9 4 ectoe | 32,778 1.505766 1.529359 -9 4 eorder | 32,778 -5.052688 3.660835 -9 2 eresult | 32,778 1.316218 1.449619 -9 4 -------------+--------------------------------------------------------- erange | 32,778 -4.13207 4.124808 -9 2 eimgres | 32,778 1.277564 1.834162 -9 4 eimage | 32,778 -4.910611 3.908494 -9 2 epnotes | 32,778 1.432302 1.483496 -9 4 ehxfu | 32,778 -4.472604 3.879488 -9 2 -------------+--------------------------------------------------------- eremind | 32,778 1.190524 2.329844 -9 4 epubhlth | 32,778 1.16206 2.567722 -9 4 enotdis | 32,778 -5.927665 2.959508 -9 4 emrnew | 32,778 .710385 3.149021 -9 3 prmcarer | 32,778 .9908475 2.75941 -9 4 -------------+--------------------------------------------------------- prmaidr | 32,778 .5931722 2.65957 -9 4 prprvtr | 32,778 1.331808 2.99759 -9 4 prpatr | 32,778 .4531698 2.621642 -9 4 prothr | 32,778 .4040515 2.513901 -9 4 mancarec | 32,778 2.762829 2.145615 -9 4 -------------+--------------------------------------------------------- prmanr | 32,778 .1246568 4.525334 -9 4 pccprod | 32,778 .0966197 3.459629 -9 2 pccsat | 32,778 .214046 3.638441 -9 2 pccqoc | 32,778 .1219721 3.691386 -9 2 pccpprof | 32,778 -.0907926 4.023817 -9 2 -------------+--------------------------------------------------------- measpub | 32,778 -4.165721 4.22245 -9 2 prp4pr | 32,778 -.88175 4.015103 -9 4 revffsr | 32,778 .8659467 4.555981 -9 4 revdiscr | 32,778 -.1100738 4.06867 -9 4 revcapr | 32,778 -.510922 3.70779 -9 4 -------------+--------------------------------------------------------- revcaser | 32,778 -.6316432 3.764907 -9 4 revothr | 32,778 -.5653487 3.85296 -9 4 aceptnew | 32,778 .9997864 .6176216 -9 2 capitate | 32,778 .4368174 2.897185 -9 2 nocap | 32,778 -.0981756 3.077544 -9 2 -------------+--------------------------------------------------------- nmedcare | 32,778 .5302337 2.174711 -9 2 nmedcaid | 32,778 .5659284 2.354935 -9 2 nworkcmp | 32,778 .533071 2.669318 -9 2 nselfpay | 32,778 .4585698 2.138964 -9 2 nnochrge | 32,778 .0593996 3.361526 -9 2 -------------+--------------------------------------------------------- ccs | 32,778 1.674385 .5739596 -8 2 ethim | 32,778 1.856733 .3503501 1 2 raceim | 32,778 1.292757 .7501553 1 6 racer | 32,778 1.247361 .5557762 1 3 raceeth | 32,778 1.615748 1.095681 1 7 -------------+--------------------------------------------------------- specr | 32,778 7.248337 4.991516 1 16 speccat | 32,778 1.837818 .8572635 1 3 agedays | 32,778 -2.676399 31.2315 -7 364 ager | 32,778 3.618311 1.538868 1 6 diag1r | 32,778 158370.9 33034.03 -9 209980 -------------+--------------------------------------------------------- diag2r | 32,778 85359.02 83382.19 -9 209930 diag3r | 32,778 41271.47 71032.35 -9 209920 scopwi1r | 32,778 101.0474 761.5556 -9 9999 scopwi2r | 32,778 -4.395692 159.3629 -9 9999 biopsywir | 32,778 118.309 988.2016 -9 9999 -------------+--------------------------------------------------------- diagsc1r | 32,778 1565.196 3441.287 -9 9999 diagsc2r | 32,778 301.4601 1667.036 -9 9999 othproc1r | 32,778 839.541 2590.434 -9 9999 othproc2r | 32,778 113.5265 1038.923 -9 9999 othproc3r | 32,778 16.30176 469.8377 -9 9999 -------------+--------------------------------------------------------- othproc4r | 32,778 -4.572213 192.3133 -9 9923 whocomp | 32,778 2.37818 2.283691 -9 5 settype | 32,778 1 0 1 1 year | 32,778 2007 0 2007 2007 cstratm | 32,778 3.15e+07 9915300 2.01e+07 4.04e+07 -------------+--------------------------------------------------------- cpsum | 32,778 44695.96 50742.45 5 106980 physwt | 1,357 235.9587 199.8366 1 2201 pctpovr | 32,778 1.602752 3.077655 -9 4 hincomer | 32,778 1.753371 3.157113 -9 4 pbamorer | 32,778 1.756849 3.153215 -9 4 -------------+--------------------------------------------------------- urbanrur | 32,778 2.063854 2.850525 -9 5 by Jean Roth , jroth@nber.org , 28 Mar 2016