I'm having difficulty interpreting the number of observations reported in the output for a set of regressions I have run with lagged operators in the current version (15.1) of Stata. The models of interest are for 8-period unbalanced panel data on various characteristics of 202 organizations and the models have the general form: regress L2.outcome L3.var1 L3.var2 L3var3..., vce(robust).Two example models are:
- Model 1: regress L2.Coll4yrPctA L3.school_enrollment L3.school_freelunch L3.school_ell L3.school_englishregent L3.Segonet_size L3.Segonet_prtnrcent L3.Segonet_yrspriorties L3.Segonet_industryHerf L3.Segonet_resourceHerf L3.Segonet_density L3.Segonet_prtnRsrcs_factor1 L3.Segonet_prtnRsrcs_factor2 L3.Segonet_prtnRsrcs_factor3 hsdistTRD hsdistALT, vce(robust)
- Model 2: regress L2.PerAchela2A L3.school_enrollment L3.school_freelunch L3.school_ell L3.school_englishregent L3.Segonet_size L3.Segonet_prtnrcent L3.Segonet_yrspriorties L3.Segonet_industryHerf L3.Segonet_resourceHerf L3.Segonet_density L3.Segonet_prtnRsrcs_factor1 L3.Segonet_prtnRsrcs_factor2 L3.Segonet_prtnRsrcs_factor3 hsdistTRD hsdistALT, vce(robust)
Code:
* Example generated by -dataex-. To install: ssc install dataex clear input int(SchoolIDnew Period) double(Coll4yrPctA PerAchela2A) float school_enrollment double school_freelunch float Segonet_prtnRsrcs_factor1 double Segonet_industryHerf byte Segonet_size float hsdistTRD 1047 4 . . 147.5 50.599998474121094 -1.1462839 .25 4 0 1047 5 . . 136 50.6 -1.1462839 .25 4 0 1047 6 . 0 159 50.6 -1.1462839 .25 4 0 1047 8 . . . . . . . 0 1400 1 . . 1204 31.9 .0816353 .3600000000000001 5 1 1400 2 . . 1290 31.9 .0816353 .3600000000000001 5 1 1400 3 . . 1425 31.9 .29680872 .30612244897959184 7 1 1400 4 . 50.9 1527 41.3 .4739265 .2839506172839506 9 1 1400 5 . 55.8 1592 48.7 .4739265 .2839506172839506 9 1 1400 6 74.2 54.6 1510 38.2 .4739265 .28125 8 1 1400 8 . . . . . . . 1 1407 1 . . 201 25.8 -1.0425215 .42857142857142855 7 1 1407 3 . . 348 25.8 -1.0425215 .42857142857142855 7 1 1407 4 . 27.3 332.75 24.7366666666667 -.8746036 .44000000000000006 5 1 1407 5 . 70.6 376 22.61 -.8746036 .44000000000000006 5 1 1407 6 74.3 69.7 406 24.7366666666667 -.8746036 .44000000000000006 5 1 1407 8 . . . . . . . 1 1408 1 . . 285 10.1 -.9744283 .3333333333333333 3 1 1408 3 . . 327 10.1 -1.400283 .375 4 1 1408 4 . 52.3 360.25 11.9633333333333 -1.400283 .375 4 1 1408 5 . 54.3 408 15.69 -1.400283 .375 4 1 1408 6 0 40 421 11.9633333333333 -1.400283 .375 4 1 1408 8 . . . . . . . 1 1409 1 . . 369 71.1 -.5091165 1 4 0 1409 2 . . 382 71.1 -.8462489 1 3 0 1409 3 . . 401 71.1 -.8462489 1 3 0 1409 4 . 34.6 382 75.4 -.3425202 .5555555555555556 6 0 1409 5 . 46.4 394 75.4 -.3425202 .5555555555555556 6 0 1409 6 81.4 42.7 402 71.8 -.3425202 .5555555555555556 6 0 1409 8 . . . . . . . 0 1411 2 . . 386 39.9 .4530426 .7551020408163265 7 0 1411 3 . . 391 39.9 .6712472 .5918367346938775 7 0 1411 4 . 54.8 405 43.1 .6712472 .5918367346938775 7 0 1411 5 . 30.4 403 41.4 .6712472 .5918367346938775 7 0 1411 6 94.7 24.7 409 38.9 .6712472 .5918367346938775 7 0 1411 8 . . . . . . . 0 1412 2 . . 439 12.75 .56599855 .26530612244897955 7 0 1412 3 . . 726 11.8 .56599855 .26530612244897955 7 0 1412 4 . 12.7 375 12.75 .56599855 .26530612244897955 7 0 1412 5 . 0 391 13.8 .56599855 .26530612244897955 7 0 1412 6 94.1 14.6 395 13.6 .56599855 .26530612244897955 7 0 1412 8 . . . . . . . 0 1413 2 . . 580 36.9 -1.0694875 1 1 0 1413 3 . . 601 38.3 -1.0694875 1 1 0 1413 4 . 55.2 607 37.8333333333333 -1.0694875 1 1 0 1413 5 . 54.2 619 37.8333333333333 -1.0694875 1 1 0 1413 6 92.3 35.6 627 37.8333333333333 -1.0694875 1 1 0 1413 8 . . . . . . . 0 1414 2 . . 354 32.5 .40832955 1 6 0 1414 3 . . 366 33.8 -.16123778 .7222222222222223 6 0 1414 4 . 59 403 33.3666666666667 -.13760601 .6800000000000002 5 0 1414 5 . 51.5 409 33.3666666666667 -.13760601 .6800000000000002 5 0 1414 6 81.6 57.7 390 33.3666666666667 -.13760601 .6800000000000002 5 0 1414 8 . . . . . . . 0 1419 1 . . 353 76 -.8175041 .625 4 0 1419 2 . . 352 76 1.1508472 .5 8 0 1419 3 . . 380 76 1.2445354 .53125 8 0 1419 4 . 80 392 77.7 .8640692 .510204081632653 7 0 1419 5 . 39.2 398 81.5 .8640692 .510204081632653 7 0 1419 6 40.3 38 404 65.9 .8640692 .510204081632653 7 0 1419 8 . . . . . . . 0 1420 1 . . 1220 57.5 -1.0432006 .5555555555555556 6 1 1420 2 . . 1273 57.5 -1.0432006 .5555555555555556 6 1 1420 3 . . 1388 57.5 -1.0432006 .510204081632653 7 1 1420 4 . 59 1484 51.2 -1.0432006 .510204081632653 7 1 1420 5 . 53.6 1607 66.2 -1.0432006 .510204081632653 7 1 1420 6 61.1 62.4 1598 66.2 -1.0432006 .510204081632653 7 1 1420 8 . . . . . . . 1 1425 1 . . 631 36.2 .5430983 .2892561983471074 11 1 1425 2 . . 599 36.2 -.6648308 .44 5 1 1425 3 . . 592 36.2 .5276936 .42857142857142855 7 1 1425 4 . 43.9 565 27.5 .5276936 .42857142857142855 7 1 1425 5 . 65.5 598 43 .5276936 .42857142857142855 7 1 1425 6 64.2 46.7 653 50.2 .5276936 .42857142857142855 7 1 1425 8 . . . . . . . 1 1429 2 . . 357 62.2 -.6260996 .3333333333333333 3 0 1429 3 . . 337 62.2 -.6260996 .3333333333333333 3 0 1429 4 . 23.9 395 85.4 -.3441155 .375 4 0 1429 5 . 29.6 416 79.6 -.3441155 .375 4 0 1429 6 7.1 21 417 70.32 -.3441155 .375 4 0 1429 8 . . . . . . . 0 1435 1 . . 1542 43.5 1.49474 .45999999999999996 10 1 1435 2 . . 1539 43.5 1.1917529 .4876033057851239 11 1 1435 3 . . 1604 43.5 1.1917529 .4876033057851239 11 1 1435 4 . 71.8 1706 48.9 1.1917529 .4876033057851239 11 1 1435 5 . 58.1 1698 58.1 1.1917529 .4876033057851239 11 1 1435 6 65.6 66.1 1634 62.2 1.1917529 .4876033057851239 11 1 1435 8 . . . . . . . 1 1439 1 . . 389 74.3 -.9437383 .3333333333333333 3 0 1439 3 . . 433 74.3 2.2387109 .3609467455621301 13 0 1439 4 . 47.5 314 63.2 2.1418884 .45833333333333337 12 0 1439 5 . 76.1 326 65.6 2.1418884 .45833333333333337 12 0 1439 6 68.3 59.7 345 64.8 2.1418884 .45833333333333337 12 0 1439 8 . . . . . . . 0 1440 1 . . 1939 69.4 -.366128 .25 8 1 1440 2 . . 2082 69.4 .7700846 .3491124260355029 13 1 1440 3 . . 2087 69.4 .7700846 .3491124260355029 13 1 1440 4 . 42.8 2303 54.1 1.3830118 .3688888888888888 15 1 1440 5 . 45.3 2151 73.6 1.3830118 .3688888888888888 15 1 1440 6 2.3 39.2 2131 64.2 1.3830118 .3688888888888888 15 1 end
0 Response to Lag operators, regression and reported "Number of obs"
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