Summary statistics for namcs2008 dataset : by Jean Roth , jroth@nber.org , 28 Mar 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- vmonth | 28,741 6.2486 3.338598 1 12 vyear | 28,741 2007.998 .0456434 2007 2008 vdayr | 28,741 3.857486 1.410669 1 7 age | 28,741 45.31826 24.6978 0 100 sex | 28,741 1.417174 .4931007 1 2 -------------+--------------------------------------------------------- ethun | 28,741 -1.943321 5.18069 -9 2 raceun | 28,741 -2.100692 4.850509 -9 6 paypriv | 28,741 .6055461 .4887416 0 1 paymcare | 28,741 .2327337 .4225813 0 1 paymcaid | 28,741 .1422706 .3493336 0 1 -------------+--------------------------------------------------------- paywkcmp | 28,741 .0102989 .1009612 0 1 payself | 28,741 .0645072 .2456585 0 1 paynochg | 28,741 .0068543 .082508 0 1 payoth | 28,741 .0367767 .1882165 0 1 paydk | 28,741 .0318708 .1756592 0 1 -------------+--------------------------------------------------------- paytyper | 28,741 1.542431 2.447426 -9 7 usetobac | 28,741 -2.006924 4.417746 -9 2 injdet | 28,741 4.65377 1.101237 -9 5 injury | 28,741 .1057027 .307462 0 1 rfv1 | 28,741 27413.05 15167.53 -9 89990 -------------+--------------------------------------------------------- rfv2 | 28,741 8534.922 14021.59 -9 89980 rfv3 | 28,741 2668.716 8211.231 -9 89980 rfv13d | 28,741 2741.276 1516.766 0 8999 rfv23d | 28,741 854.0365 1401.808 0 8998 rfv33d | 28,741 267.6449 820.8572 0 8998 -------------+--------------------------------------------------------- primcare | 28,741 .992241 2.38599 -9 2 refer | 28,741 -3.076859 4.518951 -9 2 senbefor | 28,741 1.146341 .3534544 1 2 pastvis | 28,741 2.843394 7.123061 -7 99 major | 28,741 2.241084 2.170166 -9 5 -------------+--------------------------------------------------------- diag1 | 0 diag2 | 0 diag3 | 0 diag13d | 0 diag23d | 0 -------------+--------------------------------------------------------- diag33d | 0 prdiag1 | 28,741 1.923037 .7727473 -7 2 prdiag2 | 28,741 -2.251348 4.483032 -7 2 prdiag3 | 28,741 -4.687067 3.928136 -7 2 arthrtis | 28,741 .1176716 .3222245 0 1 -------------+--------------------------------------------------------- asthma | 28,741 .0559827 .2298924 0 1 cancer | 28,741 .0572353 .2322957 0 1 castage | 28,741 -6.843186 1.243749 -8 3 cebvd | 28,741 .0195539 .1384639 0 1 chf | 28,741 .0160746 .1257647 0 1 -------------+--------------------------------------------------------- crf | 28,741 .0115514 .1068569 0 1 copd | 28,741 .0318361 .1755665 0 1 deprn | 28,741 .0948819 .2930568 0 1 diabetes | 28,741 .1028148 .3037221 0 1 hyplipid | 28,741 .1383042 .345225 0 1 -------------+--------------------------------------------------------- htn | 28,741 .2444591 .4297735 0 1 ihd | 28,741 .0458578 .2091803 0 1 obesity | 28,741 .0630806 .2431121 0 1 ostprsis | 28,741 .0207717 .1426217 0 1 nochron | 28,741 .5102815 .5564893 0 2 -------------+--------------------------------------------------------- totchron | 28,741 .7510873 2.148338 -9 14 dmp | 28,741 -5.831078 3.73781 -9 3 htin | 28,741 20.84663 35.67868 -9 84 wtlb | 28,741 97.40768 96.51574 -9 500 bmi | 28,741 4.523211 18.13962 -9 73.11 -------------+--------------------------------------------------------- tempf | 28,741 312.2825 463.418 -9 1099 bpsys | 28,741 63.50204 67.83428 -9 290 bpdias | 28,741 36.60374 42.68436 -9 190 diagscrn | 28,741 .8859817 .3470405 0 2 breast | 28,741 .0433527 .2036534 0 1 -------------+--------------------------------------------------------- pelvic | 28,741 .0529209 .2238795 0 1 rectal | 28,741 .0291222 .1681518 0 1 skin | 28,741 .1375039 .3443845 0 1 depress | 28,741 .0096378 .0976998 0 1 anyimage | 28,741 .1508298 .3578892 0 1 -------------+--------------------------------------------------------- xray | 28,741 .0553217 .228611 0 1 bonedens | 28,741 .0053234 .0727685 0 1 catscan | 28,741 .0172576 .1302319 0 1 echocard | 28,741 .0139174 .1171503 0 1 othultra | 28,741 .0299572 .1704722 0 1 -------------+--------------------------------------------------------- mammo | 28,741 .0178491 .132405 0 1 mri | 28,741 .0212936 .1443639 0 1 petscan | 28,741 .0016005 .0399749 0 1 othimage | 28,741 .0120733 .1092154 0 1 cbc | 28,741 .0911938 .2878895 0 1 -------------+--------------------------------------------------------- electrol | 28,741 .0365332 .1876159 0 1 glucose | 28,741 .0450924 .2075104 0 1 hgba | 28,741 .0271737 .1625922 0 1 cholest | 28,741 .0672906 .250529 0 1 psa | 28,741 .0220591 .1468783 0 1 -------------+--------------------------------------------------------- otherbld | 28,741 .1092864 .3120036 0 1 scopproc | 28,741 .027974 .1649011 0 1 scopewi1 | 0 scopewi2 | 0 scpwi13d | 0 -------------+--------------------------------------------------------- scpwi23d | 0 scpwi12d | 0 scpwi22d | 0 sigcolon | 28,741 .0091855 .0954014 0 1 biopsy | 28,741 .0169444 .1290655 0 1 -------------+--------------------------------------------------------- biopsywi | 0 chlamyd | 28,741 .0053582 .0730046 0 1 papconv | 28,741 .0101249 .1001137 0 1 papliq | 28,741 .0134651 .1152573 0 1 papunsp | 28,741 .0057409 .0755524 0 1 -------------+--------------------------------------------------------- pregtest | 28,741 .0046275 .0678696 0 1 hpvdna | 28,741 .0036881 .0606188 0 1 ekg | 28,741 .0264083 .1603489 0 1 spiro | 28,741 .0038969 .0623043 0 1 urine | 28,741 .0816603 .2738513 0 1 -------------+--------------------------------------------------------- othdiag | 28,741 .207578 .40558 0 1 diagsc1 | 0 diagsc2 | 0 digsc13d | 0 digsc23d | 0 -------------+--------------------------------------------------------- digsc12d | 0 digsc22d | 0 httake | 28,741 .4234021 .4941065 0 1 wttake | 28,741 .6451063 .4784894 0 1 temptake | 28,741 .3246582 .4682551 0 1 -------------+--------------------------------------------------------- blodpres | 28,741 .5438224 .4980846 0 1 totdiag | 28,741 3.138165 2.703012 -9 18 healthed | 28,741 .385338 .5253286 0 2 asthmaed | 28,741 .0086984 .0928602 0 1 dietnutr | 28,741 .1094951 .3122649 0 1 -------------+--------------------------------------------------------- exercise | 28,741 .0740406 .2618415 0 1 grwthdev | 28,741 .0303399 .1715239 0 1 injprev | 28,741 .0262691 .1599372 0 1 stresmgt | 28,741 .0246338 .1550091 0 1 tobaced | 28,741 .0267562 .1613729 0 1 -------------+--------------------------------------------------------- wtreduc | 28,741 .0298876 .1702802 0 1 othlthed | 28,741 .1978011 .3983482 0 1 tothlted | 28,741 .3519363 1.601791 -9 8 nonmed | 28,741 .2890992 .5552581 0 2 cam | 28,741 .0056713 .0750958 0 1 -------------+--------------------------------------------------------- dme | 28,741 .0079329 .0887145 0 1 homehlth | 28,741 .0015657 .0395387 0 1 hospice | 28,741 .0000696 .0083417 0 1 pt | 28,741 .0216416 .1455127 0 1 radther | 28,741 .001009 .0317495 0 1 -------------+--------------------------------------------------------- spocther | 28,741 .0022964 .0478662 0 1 psychoth | 28,741 .0208413 .1428554 0 1 othmntl | 28,741 .0178143 .1322782 0 1 excision | 28,741 .029157 .1682493 0 1 ortho | 28,741 .0187537 .1356563 0 1 -------------+--------------------------------------------------------- wound | 28,741 .0186841 .1354092 0 1 othproc | 28,741 .1000313 .300047 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 | 28,741 -.2442852 2.095957 -9 5 -------------+--------------------------------------------------------- med | 28,741 .7670227 .4671529 0 2 med1str | 0 med1 | 28,741 33742.36 40269.45 -9 99999 med2str | 0 med2 | 28,741 24205.09 37477.45 -9 99999 -------------+--------------------------------------------------------- med3str | 0 med3 | 28,741 17335.58 33725.73 -9 99999 med4str | 0 med4 | 28,741 12464.32 29775.14 -9 99999 med5str | 0 -------------+--------------------------------------------------------- med5 | 28,741 9352.379 26352.67 -9 99999 med6str | 0 med6 | 28,741 6971.452 23107.17 -9 99999 med7str | 0 med7 | 28,741 5153.372 20116.39 -9 99999 -------------+--------------------------------------------------------- med8str | 0 med8 | 28,741 3679.062 17085.35 -9 99999 ncmed1 | 28,741 -.9703907 4.018043 -9 2 ncmed2 | 28,741 -2.801781 4.406296 -9 2 ncmed3 | 28,741 -4.062176 4.190804 -9 2 -------------+--------------------------------------------------------- ncmed4 | 28,741 -4.874813 3.813044 -9 2 ncmed5 | 28,741 -5.429247 3.420035 -9 2 ncmed6 | 28,741 -5.823597 3.037527 -9 2 ncmed7 | 28,741 -6.119759 2.680257 -9 2 ncmed8 | 28,741 -6.371316 2.302394 -9 2 -------------+--------------------------------------------------------- numnew | 28,741 .5617411 .96302 0 8 numcont | 28,741 1.690616 2.384222 0 8 nummed | 28,741 2.333635 2.443301 0 8 noprovid | 28,741 .0051494 .0715758 0 1 phys | 28,741 .974566 .1574421 0 1 -------------+--------------------------------------------------------- physasst | 28,741 .0296789 .1697028 0 1 npnmw | 28,741 .0075502 .0865647 0 1 rnlpn | 28,741 .2101875 .4074488 0 1 mhp | 28,741 .0036185 .0600463 0 1 othprov | 28,741 .1550746 .3619821 0 1 -------------+--------------------------------------------------------- nodisp | 28,741 .0138826 .1170058 0 1 nofu | 28,741 .0514248 .2208664 0 1 retprn | 28,741 .2373613 .4254729 0 1 refothmd | 28,741 .0734839 .2609336 0 1 retappt | 28,741 .6865801 .4638915 0 1 -------------+--------------------------------------------------------- telephon | 28,741 .0194148 .1379801 0 1 refered | 28,741 .0022268 .0471371 0 1 admithos | 28,741 .0024355 .049292 0 1 othdisp | 28,741 .0153439 .1229188 0 1 timemd | 28,741 20.84385 13.41572 0 240 -------------+--------------------------------------------------------- patwt | 28,741 33261.5 28064.48 65 157122 region | 28,741 2.603354 1.077127 1 4 msa | 28,741 1.091716 .2886292 1 2 blank | 0 mddo | 28,741 1.072475 .2592771 1 2 -------------+--------------------------------------------------------- phycode | 28,741 2075.996 1858.19 16 7032 patcode | 28,741 14.9388 10.19992 1 75 bdatefl | 28,741 .0413347 .1990666 0 1 sexfl | 28,741 .0106816 .1028002 0 1 ethnicfl | 28,741 .3495007 .4768206 0 1 -------------+--------------------------------------------------------- racefl | 28,741 .32772 .4693903 0 1 senbefl | 28,741 .0128388 .1125807 0 1 pastfl | 28,741 .0957865 .2943034 0 1 timemdfl | 28,741 .256776 .4368624 0 1 drugid1 | 0 -------------+--------------------------------------------------------- prescr1 | 20,909 1.568942 1.307509 1 5 contsub1 | 20,909 5.80946 .8159171 1 8 comstat1 | 20,909 1.155627 .3639582 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 | 14,428 1.628015 1.378185 1 5 contsub2 | 14,428 5.789784 .8096516 2 8 comstat2 | 14,428 1.123787 .3320746 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 | 10,029 1.667365 1.420838 1 5 contsub3 | 10,029 5.819823 .73446 2 8 comstat3 | 10,029 1.107289 .3117428 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 | 7,217 1.701122 1.447067 1 5 contsub4 | 7,217 5.838021 .7025499 2 8 comstat4 | 7,217 1.098795 .3007196 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 | 5,366 1.732948 1.472096 1 5 contsub5 | 5,366 5.859672 .6592001 2 8 comstat5 | 5,366 1.089452 .2867249 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 | 3,980 1.78191 1.519803 1 5 contsub6 | 3,980 5.839447 .689272 2 8 comstat6 | 3,980 1.090955 .2901908 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 | 2,986 1.87073 1.572598 1 5 contsub7 | 2,986 5.842934 .6885851 2 8 comstat7 | 2,986 1.089082 .2860838 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 | 2,156 1.897032 1.577854 1 5 contsub8 | 2,156 5.855288 .6565217 2 8 comstat8 | 2,156 1.085807 .2850699 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 | 28,741 1.432344 1.125396 1 8 -------------+--------------------------------------------------------- solo | 28,741 1.682335 .6081596 -9 2 empstat | 28,741 1.360565 .8738939 -9 3 owns | 28,741 1.727671 1.54685 -9 7 lab | 28,741 1.464493 .8209381 -9 2 pateven | 28,741 1.605511 1.04717 -9 2 -------------+--------------------------------------------------------- nhvisr | 28,741 -.1140531 1.421675 -9 1 homvisr | 28,741 -.1829442 1.405577 -9 1 hosvisr | 28,741 .130406 2.063107 -9 1 telconr | 28,741 .0177099 2.186423 -9 1 econr | 28,741 -.2838802 1.804317 -9 1 -------------+--------------------------------------------------------- ebillrec | 28,741 1.094917 2.07231 -9 3 emedrec | 28,741 2.156571 1.337113 -9 3 edemog | 28,741 1.05393 1.094625 -9 2 eprolst | 28,741 -1.114714 4.204352 -9 4 ecpoe | 28,741 1.46926 1.426366 -9 4 -------------+--------------------------------------------------------- ewarn | 28,741 -4.39341 3.900434 -9 4 escrip | 28,741 -4.255732 4.010869 -9 4 ectoe | 28,741 1.543196 1.287886 -9 4 eorder | 28,741 -4.674333 3.850186 -9 4 eresult | 28,741 1.344943 1.224265 -9 4 -------------+--------------------------------------------------------- erange | 28,741 -3.375317 4.180665 -9 4 eimgres | 28,741 1.380154 1.388671 -9 4 eimage | 28,741 -4.324728 4.125469 -9 4 epnotes | 28,741 1.459344 1.165494 -9 4 ehxfu | 28,741 -3.851641 4.029499 -9 2 -------------+--------------------------------------------------------- eremind | 28,741 1.226993 2.145192 -9 4 epubhlth | 28,741 .9671201 2.847015 -9 4 enotdis | 28,741 -6.017153 2.860516 -9 2 emrnew | 28,741 .7465293 3.084579 -9 3 prmcarer | 28,741 1.071327 2.402749 -9 4 -------------+--------------------------------------------------------- prmaidr | 28,741 .7703977 2.323999 -9 4 prprvtr | 28,741 1.590237 2.656901 -9 4 prpatr | 28,741 .5934032 2.290099 -9 4 prothr | 28,741 .5718312 2.245361 -9 4 mancarec | 28,741 2.806618 2.254117 -9 4 -------------+--------------------------------------------------------- prmanr | 28,741 .3046519 4.481371 -9 4 pccprod | 28,741 .3648446 3.169642 -9 2 pccsat | 28,741 .4602136 3.347231 -9 2 pccqoc | 28,741 .4161303 3.347955 -9 2 pccpprof | 28,741 .3766049 3.593631 -9 2 -------------+--------------------------------------------------------- measpub | 28,741 -3.860617 4.254334 -9 2 prp4pr | 28,741 -.6498034 3.801321 -9 4 revffsr | 28,741 1.455795 3.877325 -9 4 revdiscr | 28,741 .4611879 3.507393 -9 4 revcapr | 28,741 .1424098 3.088534 -9 4 -------------+--------------------------------------------------------- revcaser | 28,741 -.0037577 3.069388 -9 4 revothr | 28,741 .0215372 3.165377 -9 4 aceptnew | 28,741 1.016318 .6021692 -9 2 capitate | 28,741 .282906 3.071513 -9 2 nocap | 28,741 -.1157232 3.075727 -9 2 -------------+--------------------------------------------------------- nmedcare | 28,741 .5333496 2.180186 -9 2 nmedcaid | 28,741 .6706099 2.222666 -9 2 nworkcmp | 28,741 .568491 2.612696 -9 2 nselfpay | 28,741 .4597613 2.10851 -9 2 nnochrge | 28,741 .3176647 3.044244 -9 2 -------------+--------------------------------------------------------- ccs | 28,741 1.612853 .9021202 -9 2 ethim | 28,741 1.864618 .3421366 1 2 raceim | 28,741 1.262691 .6943124 1 6 racer | 28,741 1.228454 .5357105 1 3 raceeth | 28,741 1.561845 1.039099 1 7 -------------+--------------------------------------------------------- specr | 28,741 6.4877 4.628619 1 15 speccat | 28,741 1.733586 .8280291 1 3 agedays | 28,741 -1.997564 33.71349 -7 364 ager | 28,741 3.546432 1.527426 1 6 diag1r | 28,741 160066.5 31771.22 -9 209980 -------------+--------------------------------------------------------- diag2r | 28,741 84480.18 82346.81 -9 209970 diag3r | 28,741 40387.54 69989.62 -9 209920 scopwi1r | 28,741 124.787 854.6184 -9 9999 scopwi2r | 28,741 -4.854737 147.2116 -9 9999 biopsywir | 28,741 111.9958 964.7123 -9 9999 -------------+--------------------------------------------------------- diagsc1r | 28,741 1856.154 3670.36 -9 9999 diagsc2r | 28,741 391.619 1876.208 -9 9999 othproc1r | 28,741 801.5876 2551.995 -9 9999 othproc2r | 28,741 73.83226 853.8167 -9 9999 othproc3r | 28,741 -2.730107 233.1943 -9 9959 -------------+--------------------------------------------------------- othproc4r | 28,741 -8.007098 97.38566 -9 9941 whocomp | 28,741 2.440347 2.056466 -9 5 settype | 28,741 1 0 1 1 year | 28,741 2008 0 2008 2008 cstratm | 28,741 3.05e+07 9990271 2.01e+07 4.04e+07 -------------+--------------------------------------------------------- cpsum | 28,741 49835.88 51108.73 5 106970 physwt | 1,188 270.83 201.6373 0 1510 pctpovr | 28,741 1.710831 2.811175 -9 4 hincomer | 28,741 2.000939 2.912736 -9 4 pbamorer | 28,741 1.960057 2.904944 -9 4 -------------+--------------------------------------------------------- urbanrur | 28,741 2.065725 2.48369 -9 5 by Jean Roth , jroth@nber.org , 28 Mar 2016