Not able to get inverted parabola for data (though theory says so)

Hi all, can someone please help me understand the nature of the data and the unexpected results I have pertaining to my research question. Theory says that government support (tariff - FIT) for wind should increase initially but decrease later once the technology becomes market competitive. So on running the model FIT vs SGEN I should get inverted parabola but I am getting opposite signs for SGENSQ (getting positive sign in place of positive). Though data also matches theory (on a quick glance - FIT increasing first and then decreasing with increasing SGEN).

ps: Please pardon my limited knowledge of stata and econometrics which I learnt only last year in college.

Code:

* Example generated by -dataex-. To install: ssc install dataex
clear
input byte(COUNTRIES year) double(FIT SGEN) float(year06 year07 year08 year09 year10 year11 year12 year13 year14 year15 year16 year17 FIT1 t SGENSQ SCAPSQ EP1 LGD)
1  6                .068  .1030657647921458 1 0 0 0 0 0 0 0 0 0 0 0       6.8  1 .010622552 .10913751  7.174281 1.1214511         .         .         .         .        .        .         .         .
1  7                 .07  .1833960311811863 0 1 0 0 0 0 0 0 0 0 0 0         7  2 .033634104   .341685   7.27279 1.2492843  .3303597 .10913751       6.8 .10306577     2.07      2.8  908.6755  7.174281
1  8               .0828 .34571949230182764 0 0 1 0 0 0 0 0 0 0 0 0      8.28  3  .11952197 1.1153826  7.664484 1.3363228  .5845383   .341685         7 .18339603      4.2      5.7  859.5363   7.27279
1  9  .08369627042152661  .7059139714833435 0 0 0 1 0 0 0 0 0 0 0 0  8.369627  4   .4983145 4.0102744  7.854073  1.421188 1.0561167 1.1153824      8.28  .3457195   8.3877     11.4   810.397  7.664484
1 10  .08271458602683496  1.231698251526181 0 0 0 0 1 0 0 0 0 0 0 0  8.271459  5  1.5170805  9.337914  7.828656  1.517435  2.002567  4.010275  8.369627   .705914  17.5994     24.9  882.1503  7.854073
1 11   .0822274205572615  1.605950526697121 0 0 0 0 0 1 0 0 0 0 0 0  8.222742  6   2.579077 18.898586  7.771446 1.6037307    3.0558  9.337914  8.271459 1.2316983  29.6335  49.0711       644  7.828656
1 12  .08201715320940489 2.1753109914363833 0 0 0 0 0 0 1 0 0 0 0 0  8.201715  7   4.731978  28.61519  7.605576 1.6744876 4.3472505 18.898586  8.222742 1.6059505  46.3546  71.6528  574.5655  7.771446
1 13  .08142128912326714 2.6797004534055593 0 0 0 0 0 0 0 1 0 0 0 0  8.142129  8   7.180795 36.786377  7.695268  1.744265  5.349317  28.61519  8.201715  2.175311  61.5969 103.0128 564.89197  7.605576
1 14  .08050715767495024   2.97342537920674 0 0 0 0 0 0 0 0 1 0 0 0  8.050715  9   8.841258  49.44025  7.615321 1.8096385  6.065177 36.786377  8.142129 2.6797004  76.7305 138.5582 595.84717  7.695268
1 15                .078  3.337814035924643 0 0 0 0 0 0 0 0 0 1 0 0       7.8 10  11.141003  75.33122  7.406165 1.8712827  7.031376  49.44025  8.050715 2.9734254  96.8191 160.2055  569.0015  7.615321
1 16                .075  4.120177226790112 0 0 0 0 0 0 0 0 0 0 1 0       7.5 11   16.97586  81.21066  6.805224  1.930719  8.679357  75.33123       7.8  3.337814 131.5977 185.6651  466.4218  7.406165
1 17                .071  3.720850249589043 0 0 0 0 0 0 0 0 0 0 0 1       7.1 12  13.844727  93.80511  6.584537 1.9918512  9.011696  81.21066       7.5 4.1201773 148.9827 242.3877  417.2825  6.805224
2  6 .056461731493099125 5.1743944475765264 1 0 0 0 0 0 0 0 0 0 0 0  5.646173  1   26.77436 239.85153  21.16058  3.700236         .         .         .         .        .        .         .         .
2  7  .06265389876880985  6.643709596632992 0 1 0 0 0 0 0 0 0 0 0 0   6.26539  2   44.13888  262.3459  22.66835  3.733658  15.48714 239.85153  5.646173  5.174395   20.474    30.71 1815.6436  21.16058
2  8  .06720351390922401  6.770107673645236 0 0 1 0 0 0 0 0 0 0 0 0  6.720351  3   45.83436 252.52277  20.48422  3.746325 16.197096 262.34592   6.26539   6.64371   22.116   39.713  1746.071  22.66835
2  9  .06388888888888888  6.934366813794093 0 0 0 1 0 0 0 0 0 0 0 0  6.388889  4   48.08544 286.62698 17.457754   3.69103 15.890965 252.52275  6.720351  6.770108   22.794   40.574 1676.4988  20.48422
2 10 .061059602649006624  6.387213769761452 0 0 0 0 1 0 0 0 0 0 0 0   6.10596  5    40.7965  272.7566 18.230679  3.732551 16.930061 286.62698  6.388889  6.934367   25.732   38.648  1609.067 17.457754
2 11  .06318497913769124  8.505996544015918 0 0 0 0 0 1 0 0 0 0 0 0  6.318498  6  72.351974  291.9905 17.712183  3.787034 16.515345 272.75662   6.10596  6.387214   26.903   37.795  1538.625 18.230679
2 12  .07974293059125964   8.56896276071248 0 0 0 0 0 0 1 0 0 0 0 0  7.974293  7  73.427124  301.5401 17.677946 3.7900646  17.08773 291.99054  6.318498  8.505997   28.712   48.891 1469.8903 17.712183
2 13  .08715803452855245  8.606012358141232 0 0 0 0 0 0 0 1 0 0 0 0  8.715803  8  74.063446  326.3659 18.734407 3.7922194  17.36491  301.5401  7.974293  8.568963   30.979   50.681  1390.063 17.677946
2 14    .091657824933687   9.71233847327774 0 0 0 0 0 0 0 0 1 0 0 0  9.165783  9   94.32952  382.2531 17.846724  3.807164   18.0656  326.3659  8.715803  8.606012   33.477   51.721 1322.8143 18.734407
2 15  .07629711751662971 12.980954645423568 0 0 0 0 0 0 0 0 0 1 0 0  7.629712 10   168.5052  480.2829  14.81371  3.815789 19.551294  382.2531  9.165783  9.712338   38.614   57.379  1267.512 17.846724
2 16  .07627212389380532 12.826215179366617 0 0 0 0 0 0 0 0 0 0 1 0  7.627213 11   164.5118  565.7325 14.262878  3.826966  21.91536  480.2829  7.629712 12.980954    44.58   79.206 1189.4918  14.81371
2 17  .07295377677564825 12.731585736211967 0 0 0 0 0 0 0 0 0 0 0 1  7.295378 12  162.09328  653.5629 14.288498  3.844754  23.78513  565.7325  7.627213 12.826215   49.592   78.598 1119.9194 14.262878
3  6  .09410288582183186  8.311555502421346 1 0 0 0 0 0 0 0 0 0 0 0  9.410289  1  69.081955  207.7364 16.319778   3.46152         .         .         .         .        .        .         .         .
3  7  .10690834473324214  9.612474794189376 0 1 0 0 0 0 0 0 0 0 0 0 10.690834  2   92.39967 278.50394 18.748457  3.480006 14.413063  207.7364  9.410289  8.311556   11.722   23.297 1628.7825 16.319778
3  8   .0629575402635432 11.132416009999641 0 0 1 0 0 0 0 0 0 0 0 0  6.295754  3  123.93069  311.9084 17.886976 3.4751675 16.688437  278.5039 10.690834  9.612474    14.82   27.568 1523.5084 18.748457
3  9  .05913888888888889  13.68125998672397 0 0 0 1 0 0 0 0 0 0 0 0  5.913889  4   187.1769  393.5623 16.330366 3.4299185 17.660927  311.9083  6.295754 11.132416   16.555   32.946 1418.2343 17.886976
3 10 .060331125827814566 15.577675566325622 0 0 0 0 1 0 0 0 0 0 0 0  6.033113  5  242.66397  411.0326 19.903315  3.425455 19.838404  393.5623  5.913889  13.68126   19.176   38.117 1340.7026 16.330366
3 11  .05694019471488178  15.46240435884307 0 0 0 0 0 1 0 0 0 0 0 0  5.694019  6  239.08595  437.5426 18.206596  3.411864  20.27394  411.0325  6.033113 15.577676   20.693   44.271 1221.8467 19.903315
3 12  .05460154241645244 17.719845065973043 0 0 0 0 0 0 1 0 0 0 0 0  5.460154  7   313.9929  468.5415 18.584127    3.3815  20.91752  437.5426  5.694019 15.462404   21.529   42.918 1028.2157 18.206596
3 13  .05840637450199203 20.694142207054103 0 0 0 0 0 0 0 1 0 0 0 0  5.840638  8   428.2475   467.895  19.16419  3.367572  21.64582  468.5415  5.460154 17.719845   22.789   49.472  997.3483 18.584127
3 14  .04428381962864721 19.773298014884507 0 0 0 0 0 0 0 0 1 0 0 0  4.428382  9   390.9833  467.9355 21.298264 3.3842676  21.63088   467.895  5.840638  20.69414   22.958   55.646  918.6774  19.16419
3 15  .04004434589800443 18.654239835472065 0 0 0 0 0 0 0 0 0 1 0 0 4.0044346 10  347.98065  463.0162  15.70312   3.41879 21.631815  467.9354  4.428382   19.7733   22.975   52.013  791.8588 21.298264
3 16  .03969026548672567  18.91261109892534 0 0 0 0 0 0 0 0 0 0 1 0 3.9690266 11   357.6869  471.7557 19.894176  3.450166  21.51781  463.0162 4.0044346  18.65424   22.943   49.325  681.3156  15.70312
3 17  .03489289740698985  22.91862645010617 0 0 0 0 0 0 0 0 0 0 0 1   3.48929 12   525.2634 410.59155  21.24259  3.478336  21.71994  471.7557 3.9690266 18.912611   23.003   48.906 576.04144 19.894176
4  6  .08235112908219146  .9449411001332102 1 0 0 0 0 0 0 0 0 0 0 0  8.235113  1   .8929137 16.480648  8.235113 .04391539         .         .         .         .        .        .         .         .
4  7  .09971811862280476 1.2098317680401809 0 1 0 0 0 0 0 0 0 0 0 0  9.971812  2   1.463693  21.52787  9.971812 .12229734 4.0596366  16.48065  8.235113  .9449411    6.315   6.8737 1242.8097  8.235113
4  8  .09298178843540637  1.472655622983437 0 0 1 0 0 0 0 0 0 0 0 0  9.298179  3  2.1687145 33.452515  9.298179 .14577213 4.6398134  21.52787  9.971812 1.2098317   7.8445    9.387 1185.5687  9.971812
4  9  .09461832455324863 1.6853251424645357 0 0 0 1 0 0 0 0 0 0 0 0  9.461832  4   2.840321 33.215816  7.556883 .21296374  5.783815 33.452515  9.298179 1.4726557  10.2425  11.8351 1128.3276  9.298179
4 10  .08157284695796702  1.757603167125818 0 0 0 0 1 0 0 0 0 0 0 0  8.157285  5   3.089169  40.26548  8.029348 .29696646  5.763316 33.215813  9.461832  1.685325   10.925   14.595  1002.891  7.556883
4 11  .08442254124705378 1.9419094408972226 0 0 0 0 0 1 0 0 0 0 0 0  8.442254  6   3.771012  46.50406  7.623583  .3481208  6.345509  40.26548  8.157285  1.757603   13.184   16.104      1095  8.029348
4 12  .09113535565245055 2.1899104979976007 0 0 0 0 0 0 1 0 0 0 0 0  9.113536  7   4.795708  43.72822  6.903216  .3886361  6.819389  46.50406  8.442254 1.9419094   16.179  19.5281  978.3401  7.623583
4 13   .0895935014846923  2.206171508722172 0 0 0 0 0 0 0 1 0 0 0 0  8.959351  8   4.867193  42.08582    6.2047  .4383467  6.612732  43.72822  9.113536 2.1899104  17.2997  23.0692  869.7832  6.903216
4 14  .08913649025069638 2.2440186596124247 0 0 0 0 0 0 0 0 1 0 0 0  8.913649  9    5.03562  51.41434  5.735734  .4979386  6.487359  42.08582  8.959351 2.2061715  18.4204    24.64  852.4359    6.2047
4 15  .08323980546202768 2.4757535327077873 0 0 0 0 0 0 0 0 0 1 0 0   8.32398 10   6.129355  52.70134   5.45635  .5646532  7.170379  51.41434  8.913649 2.2440186  22.4653  27.2354  769.4536  5.735734
4 16  .07976783986903789  2.616282973870522 0 0 0 0 0 0 0 0 0 0 1 0  7.976784 11   6.844936  60.90283  5.239104  .6218823  7.259569  52.70134   8.32398 2.4757535  25.0882  31.8729  727.6403   5.45635
4 17  .06142317496391388 2.6328483180182287 0 0 0 0 0 0 0 0 0 0 0 1  6.142317 12    6.93189 75.461784  5.551477  .6752862  7.804027  60.90283  7.976784  2.616283  28.7004  36.2731  670.3992  5.239104
5  6   .0847145488029466 1.1468509995980456 1 0 0 0 0 0 0 0 0 0 0 0  8.471455  1  1.3152672  5.464934 18.298199 3.6992936         .         .         .         .        .        .         .         .
5  7              .09358  1.434723351931599 0 1 0 0 0 0 0 0 0 0 0 0     9.358  2  2.0584311  8.792028  20.74162  3.714801 2.3377197  5.464933  8.471455  1.146851    1.955    4.225  1570.385 18.298199
5  8  .09191176470588236 1.9753606752383936 0 0 1 0 0 0 0 0 0 0 0 0  9.191176  3    3.90205 16.490583  19.59899  3.702194  2.965135  8.792027     9.358 1.4347234    2.477    5.274 1500.4738  20.74162
5  9  .09155763239875389 2.6599463598019435 0 0 0 1 0 0 0 0 0 0 0 0  9.155764  4   7.075315 25.966637 17.271255   3.65185 4.0608597 16.490582  9.191176 1.9753606    3.447    7.124 1430.5626  19.59899
5 10  .10761978361669242  2.895885022272075 0 0 0 0 1 0 0 0 0 0 0 0 10.761978  5    8.38615 34.015644 17.448223  3.660815  5.095747 25.966637  9.155764 2.6599464     4.42    9.283 1439.2864 17.271255
5 11  .11652243589743588 4.6642139927237904 0 0 0 0 0 1 0 0 0 0 0 0 11.652244  6   21.75489   50.2189 18.594858   3.66742  5.832294 34.015648 10.761978  2.895885    5.421   10.286    1300.5 17.448223
5 12  .09369668246445498  5.861470132432545 0 0 0 0 0 0 1 0 0 0 0 0  9.369668  7   34.35683  89.71994 19.410496  3.675171   7.08653   50.2189 11.652244  4.664214    6.596   15.963 1000.5692 18.594858
5 13           .09253125  8.500219652117503 0 0 0 0 0 0 0 1 0 0 0 0  9.253125  8   72.25373 147.30177 20.098736  3.688792  9.472061  89.71994  9.369668   5.86147     9.03   19.847  1266.975 19.410496
5 14  .10412828947368422 10.112021031636873 0 0 0 0 0 0 0 0 1 0 0 0  10.41283  9  102.25297 185.24644 22.051596  3.711344 12.136794 147.30177  9.253125  8.500219   11.282   28.397 1077.4592 20.098736
5 15  .11032061068702291 12.678974111646296 0 0 0 0 0 0 0 0 0 1 0 0  11.03206 10   160.7564 219.03877  19.72275  3.726583 13.610527 185.24644  10.41283 10.112021   13.074   31.959 1030.4518 22.051596
5 16  .07354925775978408 11.744827429268586 0 0 0 0 0 0 0 0 0 0 1 0  7.354926 11  137.94096 279.15317 17.319893  3.738615 14.799958 219.03876  11.03206 12.678974   14.316   40.317  941.1846  19.72275
5 17  .06661518661518662 13.774238815898649 0 0 0 0 0 0 0 0 0 0 0 1  6.661519 12  189.72966  390.7142 17.035942  3.749845 16.707878  279.1532  7.354926 11.744827   16.217   37.367  871.2734 17.319893
6  6  .15056461731493098 1.0254074639999493 1 0 0 0 0 0 0 0 0 0 0 0  15.05646  1  1.0514605  4.517632 19.228575 3.6342165         .         .         .         .        .        .         .         .
6  7   .4103967168262654 1.3889386222720475 0 1 0 0 0 0 0 0 0 0 0 0  41.03967  2  1.9291505  8.329422   21.2351  3.643798  2.125472 4.5176315  15.05646 1.0254074    1.902    2.971 2002.7805 19.228575
6  8  .17862371888726208 1.6426067523741767 0 0 1 0 0 0 0 0 0 0 0 0 17.862371  3   2.698157 12.761048 19.532835  3.626614  2.886074  8.329422  41.03967 1.3889387    2.702    4.034 1918.4713   21.2351
6  9  .16805555555555557  2.393645918198989 0 0 0 1 0 0 0 0 0 0 0 0 16.805555  4   5.729541  23.07487 16.968405 3.5656774  3.572261  12.76105 17.862371 1.6426067    3.525    4.861  1834.162 19.532835
6 10  .15894039735099338 3.2198444595671365 0 0 0 0 1 0 0 0 0 0 0 0  15.89404  5  10.367398  29.53664  19.47654  3.579326  4.803631  23.07487 16.805555  2.393646    4.879    6.543 1825.6873 16.968405
6 11  .14325452016689846 3.4453505735096446 0 0 0 0 0 1 0 0 0 0 0 0 14.325452  6   11.87044 33.909462    17.804  3.583356  5.434762  29.53664  15.89404  3.219844    5.794    9.126      1592  19.47654
6 12  .13110539845758354  4.733683603087744 0 0 0 0 0 0 1 0 0 0 0 0  13.11054  7   22.40776  42.28199  18.86473 3.5520654  5.823184 33.909466 14.325452  3.445351    6.918    9.856  1511.367    17.804
6 13  .13280212483399734  5.406278352386137 0 0 0 0 0 0 0 1 0 0 0 0 13.280212  8  29.227846  47.06259  18.96135   3.52304   6.50246  42.28199  13.11054 4.7336836    8.102   13.407 1493.9615  18.86473
6 14   .1273209549071618 5.6921151491868205 0 0 0 0 0 0 0 0 1 0 0 0 12.732096  9  32.400173  50.86547 18.140472  3.515001  6.860218  47.06258 13.280212  5.406278    8.542   14.897 1543.1458  18.96135
6 15   .1057760532150776 5.5071791444862095 0 0 0 0 0 0 0 0 0 1 0 0 10.577605 10   30.32902   61.0243  16.36057   3.52544  7.132003  50.86547 12.732096  5.692115    8.683   15.178  1268.316 18.140472
6 16  .10685840707964601  6.425445651096812 0 0 0 0 0 0 0 0 0 0 1 0  10.68584 11   41.28635  67.56673 15.781237 3.5356846  7.811805   61.0243 10.577605  5.507179    9.137   14.844 1243.9972  16.36057
6 17  .10822998872604284   7.28789863287634 0 0 0 0 0 0 0 0 0 0 0 1    10.823 12   53.11347  55.66747 16.309982  3.551851  8.219898  67.56673  10.68584  6.425446    9.384   17.689 1159.6879 15.781237
7  6 .050188205771643665   .401857028845931 1 0 0 0 0 0 0 0 0 0 0 0  5.018821  1  .16148907  1.489602 12.407182   3.71167         .         .         .         .        .        .         .         .
7  7  .11447332421340631  .7558941449553874 0 1 0 0 0 0 0 0 0 0 0 0 11.447332  2  .57137597  3.639554 13.777563 3.7288234 1.2204925  1.489602  5.018821   .401857    1.412    2.182  2644.646 12.407182
7  8  .06149341142020498 1.0462247986880848 0 0 1 0 0 0 0 0 0 0 0 0  6.149341  3  1.0945864 8.3583975 12.764556  3.725186 1.9077615  3.639554 11.447332  .7558941    2.223     4.07   2445.99 13.777563
7  9 .057611111111111106  1.558528456027002 0 0 0 1 0 0 0 0 0 0 0 0  5.761111  4   2.429011 14.793272 11.185722  3.690186  2.891089  8.358397  6.149341 1.0462248    3.403    5.694 2247.3342 12.764556
7 10  .04703311258278146  1.841307816232259 0 0 0 0 1 0 0 0 0 0 0 0 4.7033114  5  3.3904145  22.70554  12.06206  3.704712 3.8462024 14.793273  5.761111 1.5585284    4.582    7.912 2063.3132 11.185722
7 11 .045952712100139084 2.2501018445532863 0 0 0 0 0 1 0 0 0 0 0 0  4.595271  6   5.062958 28.417774 11.852897 3.7204545  4.765033  22.70554 4.7033114 1.8413078    5.912    9.945 1852.5186  12.06206
7 12  .04708226221079692  2.781844414517911 0 0 0 0 0 0 1 0 0 0 0 0  4.708226  7   7.738658 34.283157  11.70344   3.71744  5.330832 28.417774  4.595271 2.2501018    6.679   12.052 1608.8114 11.852897
7 13  .05335989375830013  2.951598425028701 0 0 0 0 0 0 0 1 0 0 0 0  5.335989  8   8.711933  41.06712  12.52137  3.718038  5.855182 34.283157  4.708226 2.7818444    7.517   14.913  1411.216  11.70344
7 14  .06647214854111405 3.2222326543511834 0 0 0 0 0 0 0 0 1 0 0 0  6.647215  9  10.382783  50.36528   13.0963  3.722671  6.408363  41.06712  5.335989 2.9515984    8.202   16.033 1381.5582  12.52137
7 15 .056518847006651884  3.918709055631505 0 0 0 0 0 0 0 0 0 1 0 0  5.651885 10   15.35628  61.82552 11.144668  3.729117   7.09685  50.36528  6.647215 3.2222326    9.068   17.249  994.8186   13.0963
7 16 .053152654867256635  4.044514302404251 0 0 0 0 0 0 0 0 0 0 1 0  5.315266 11  16.358095  76.86417 10.985559  3.736931   7.86292  61.82552  5.651885  3.918709   10.217   21.249  856.7444 11.144668
7 17  .05191657271702367  4.503509277090901 0 0 0 0 0 0 0 0 0 0 0 1  5.191657 12  20.281595  96.00483  11.17286  3.751097  8.767221  76.86417  5.315266  4.044514   11.467     21.4  658.0887 10.985559
8  6  .09700176366843034  .4173353651642256 1 0 0 0 0 0 0 0 0 0 0 0  9.700176  1   .1741688 1.3138033  8.183296 3.8719306         .         .         .         .        .        .         .         .
8  7  .11173184357541899  .4906183716756404 0 1 0 0 0 0 0 0 0 0 0 0 11.173184  2   .2407064 2.1555605  9.274802   3.88265 1.1462126 1.3138033  9.700176  .4173354    1.423    2.473 1858.9625  8.183296
8  8  .11246485473289598   .616272656724091 0 0 1 0 0 0 0 0 0 0 0 0 11.246486  3    .379792  3.411914  8.842438 3.8817816 1.4681827 2.1555605 11.173184  .4906184     1.84    3.007  1824.585  9.274802
8  9   .1189851268591426  1.116040668851357 0 0 0 1 0 0 0 0 0 0 0 0 11.898513  4  1.2455468  6.221249  7.905523 3.8403935 1.8471367  3.411914 11.246486  .6162726    2.336    3.788 1790.2074  8.842438
8 10  .12815533980582525 1.4937479354807734 0 0 0 0 1 0 0 0 0 0 0 0 12.815534  5   2.231283   8.98903  8.586698 3.8596234  2.494243  6.221249 11.898513 1.1160407    3.282    6.641 1714.9403  7.905523
8 11  .13232323232323231 1.6603183299795563 0 0 0 0 0 1 0 0 0 0 0 0 13.232324  6   2.756657 15.694947  8.620475  3.880676  2.998171   8.98903 12.815534  1.493748    3.967    8.724  1666.125  8.586698
8 12  .12912912912912913  1.843958403167891 0 0 0 0 0 0 1 0 0 0 0 0 12.912913  7  3.4001825 22.515347  9.196453  3.886177  3.961685 15.694947 13.232324 1.6603184    5.265   10.187  1784.227  8.620475
8 13  .12475728155339806  2.814271022179959 0 0 0 0 0 0 0 1 0 0 0 0 12.475728  8   7.920121 34.257133  9.243593  3.899129 4.7450337 22.515345 12.912913 1.8439584    6.201    11.31  1725.845  9.196453
8 14  .11573236889692586 3.5296248249047366 0 0 0 0 0 0 0 0 1 0 0 0 11.573236  9   12.45825  50.20697  9.338509   3.91645   5.85296 34.257137 12.475728  2.814271    7.801   17.963 1606.3263  9.243593
8 15  .09929632525410477  4.074610578561731 0 0 0 0 0 0 0 0 0 1 0 0  9.929632 10  16.602451  57.69088  8.073607  3.918081  7.085688  50.20697 11.573236  3.529625    9.694   22.538 1521.8533  9.338509
8 16  .09433962264150944  4.735957879499566 0 0 0 0 0 0 0 0 0 0 1 0  9.433962 11  22.429296 69.575134  8.678102  3.920137  7.595451  57.69088  9.929632 4.0746107   11.214   26.446  1549.565  8.073607
8 17  .09553158705701079   4.65511134903212 0 0 0 0 0 0 0 0 0 0 0 1  9.553159 12   21.67006  72.00872  8.697777 3.9380004  8.341171 69.575134  9.433962  4.735958   11.973   30.766 1515.1873  8.678102
9  6 .060225846925972396     6.320891226214 1 0 0 0 0 0 0 0 0 0 0 0  6.022585  1   39.95367 135.38797  23.27946 3.1048684         .         .         .         .        .        .         .         .
9  7  .06662106703146375  9.013478465891229 0 1 0 0 0 0 0 0 0 0 0 0  6.662107  2    81.2428  215.2206 24.563055   3.12752 11.635633 135.38797  6.022585  6.320891    1.681    2.925 1554.6346  23.27946
9  8  .07174231332357248  13.25599098491299 0 0 1 0 0 0 0 0 0 0 0 0  7.174232  3   175.7213 328.38055  21.90554  3.128069   14.6704 215.22063  6.662107  9.013478    2.201    4.037 1513.3413 24.563055
9  9  .06820833333333333  16.00501210145365 0 0 0 1 0 0 0 0 0 0 0 0  6.820833  4   256.1604  365.2551  18.63167  3.096882 18.121273  328.3805  7.174232  13.25599    2.857    5.757  1472.048  21.90554
end

Code used:
xtreg FIT1 SGEN SGENSQ, fe

Fixed-effects (within) regression Number of obs = 288
Group variable: COUNTRIES Number of groups = 24

R-sq: Obs per group:
within = 0.1559 min = 12
between = 0.2608 avg = 12.0
overall = 0.2215 max = 12

F(2,262) = 24.20
corr(u_i, Xb) = 0.1054 Prob > F = 0.0000

------------------------------------------------------------------------------
FIT1 | Coef. Std. Err. t P>|t| [95% Conf. Interval]
-------------+----------------------------------------------------------------
SGEN | -.4460316 .0833138 -5.35 0.000 -.6100815 -.2819816
SGENSQ | .0084565 .0025154 3.36 0.001 .0035035 .0134096
_cons | 9.623024 .4163931 23.11 0.000 8.803121 10.44293
-------------+----------------------------------------------------------------
sigma_u | 3.177689
sigma_e | 2.5218075
rho | .61357308 (fraction of variance due to u_i)
------------------------------------------------------------------------------
F test that all u_i=0: F(23, 262) = 18.81 Prob > F = 0.0000

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Home / Data Cleaning / Data management / Data Processing / Not able to get inverted parabola for data (though theory says so)
Not able to get inverted parabola for data (though theory says so)