-+ -0 | 1089 11.18676 0238395 786703 11.13998 11.23354 | 351 11.23142 038755 7260752 11.1552 11.30764 -+ -combined | 1440 11.19765 0203533 7723546 11.15772 11.23757 -+ -diff | -.0446601 0474075 -.1376554 0483353 -diff = mean(0) - mean(1) t = -0.9420 Ho: diff = degrees of freedom = 1438 Ha: diff < Pr(T < t) = 0.1732 Ha: diff != Pr(|T| > |t|) = 0.3463 Ha: diff > Pr(T > t) = 0.8268 Phụ lục 5: Hệ số tương quan | lnTHUN~P QUYMOHO TYLEPH~C SLDLV SNDIHOC DANTOC GIOITINH -+ lnTHUNHAP | 1.0000 | | QUYMOHO | 0.4597 1.0000 | 0.0000 | TYLEPHUTHUOC | -0.0698 0.2860 1.0000 | 0.0080 0.0000 | SLDLV | 0.4671 0.5871 -0.3311 1.0000 | 0.0000 0.0000 0.0000 | SNDIHOC | 0.3264 0.0358 -0.1075 0.3583 1.0000 | 0.0000 0.1746 0.0000 0.0000 | DANTOC | 0.1113 0.0561 0.0400 0.0298 0.1026 1.0000 | 0.0000 0.0332 0.1290 0.2577 0.0001 | GIOITINH | 0.1756 0.1872 -0.0784 0.2332 0.2067 0.0676 1.0000 | 0.0000 0.0000 0.0029 0.0000 0.0000 0.0103 | TUOI | -0.1279 -0.0104 0.0163 -0.2169 -0.5635 -0.0089 -0.2287 | 0.0000 0.6942 0.5373 0.0000 0.0000 0.7371 0.0000 | HOCVAN | 0.3341 0.0409 -0.0065 0.1048 0.6987 0.1488 0.1971 | 0.0000 0.1205 0.8059 0.0001 0.0000 0.0000 0.0000 | NHANLUONG | -0.0352 -0.0067 -0.0642 0.1204 0.2633 -0.0186 0.1889 | 0.1813 0.8006 0.0149 0.0000 0.0000 0.4809 0.0000 | SXKD | 0.0904 -0.0532 -0.0657 0.0045 0.1821 0.0535 -0.0975 | 0.0006 0.0435 0.0127 0.8647 0.0000 0.0424 0.0002 | CBVC | 0.1576 -0.0182 0.0099 0.0317 0.3455 -0.0042 0.0342 | 0.0000 0.4900 0.7063 0.2295 0.0000 0.8724 0.1942 | VAYVON | 0.0248 0.0449 -0.0381 0.0626 0.0206 -0.0174 0.0566 | 0.3463 0.0883 0.1489 0.0176 0.4338 0.5104 0.0318 | lnCANHTACLUA | 0.1707 0.1925 -0.0429 0.1799 0.0632 -0.0603 0.1109 | 0.0000 0.0000 0.1038 0.0000 0.0164 0.0220 0.0000 | lnCAYLAUNAM | 0.0974 0.0231 -0.1304 0.0261 -0.0477 0.0225 0.0212 | 0.0002 0.3801 0.0000 0.3228 0.0706 0.3940 0.4218 | lnTHUYSAN | 0.0500 0.1623 -0.0821 0.1675 -0.0385 0.0206 0.1844 | 0.0579 0.0000 0.0018 0.0000 0.1447 0.4337 0.0000 | | TUOI HOCVAN NHANLU~G SXKD CBVC VAYVON lnCANH~A -+ TUOI | 1.0000 | | HOCVAN | -0.2999 1.0000 | 0.0000 | NHANLUONG | | | SXKD | | | CBVC | | | VAYVON | | | lnCANHTACLUA | | | lnCAYLAUNAM | | | lnTHUYSAN | | | -0.4052 0.0000 0.1264 0.0000 1.0000 -0.0950 0.0003 0.1244 0.0000 -0.2404 0.0000 1.0000 -0.1039 0.0001 0.4097 0.0000 0.2454 0.0000 -0.0612 0.0203 1.0000 -0.0418 0.1131 0.0215 0.4139 0.0224 0.3960 -0.0198 0.4518 -0.0165 0.5320 1.0000 -0.0230 0.3830 0.0443 0.0926 -0.1088 0.0000 -0.1715 0.0000 -0.0344 0.1924 0.1609 0.0000 1.0000 0.1434 0.0000 0.0307 0.2449 -0.0832 0.0016 -0.0884 0.0008 -0.0122 0.6439 0.0575 0.0290 0.1264 0.0000 -0.0631 0.0167 -0.0987 0.0002 -0.0160 0.5446 -0.1709 0.0000 -0.0492 0.0617 0.0686 0.0092 0.1244 0.0000 | lnCAYL~M lnTHUY~N -+ -lnCAYLAUNAM | 1.0000 | | lnTHUYSAN | 0.0902 1.0000 | 0.0006 Phụ lục 6: Kết hồi quy ban đầu Source | SS df MS -+ -Model | 337.00907 15 22.4672714 Residual | 521.400038 1424 366151712 -+ -Total | 858.409108 1439 596531694 Number of obs F( 15, 1424) Prob > F R-squared Adj R-squared Root MSE = = = = = = 1440 61.36 0.0000 0.3926 0.3862 6051 -lnTHUNHAP | Coef Std Err t P>|t| [95% Conf Interval] -+ -QUYMOHO | 2043526 0189821 10.77 0.000 1671167 2415884 TYLEPHUTHUOC | -.0037858 0009191 -4.12 0.000 -.0055888 -.0019828 SLDLV | 1049482 029165 3.60 0.000 0477372 1621592 SNDIHOC | 0153313 0074548 2.06 0.040 0007077 0299549 DANTOC | 1327102 057519 2.31 0.021 0198792 2455412 GIOITINH | 0327503 0405931 0.81 0.420 -.0468783 1123789 TUOI | -.0015361 001569 -0.98 0.328 -.0046138 0015416 HOCVAN | 0394192 006517 6.05 0.000 0266353 0522032 NHANLUONG | -.1841372 0400618 -4.60 0.000 -.2627237 -.1055506 SXKD | 0914623 0478674 1.91 0.056 -.002436 1853605 CBVC | 3364172 0973669 3.46 0.001 1454193 5274151 VAYVON | -.0320539 0378039 -0.85 0.397 -.1062113 0421034 lnCANHTACLUA | 0070975 0033496 2.12 0.034 0005269 0136681 lnCAYLAUNAM | 0133002 0046213 2.88 0.004 004235 0223654 lnTHUYSAN | -.0054448 0037884 -1.44 0.151 -.0128762 0019866 _cons | 10.01305 1262819 79.29 0.000 9.765336 10.26077 Phụ lục 7: Các kiểm định mơ hình Kiểm định tượng đa cộng tuyến Variable | VIF 1/VIF -+ -SLDLV | 3.64 0.274963 SNDIHOC | 3.58 0.279472 QUYMOHO | 3.13 0.319835 HOCVAN | 2.46 0.406966 TYLEPHUTHUOC | 2.12 0.470633 TUOI | 1.82 0.548038 NHANLUONG | 1.50 0.667075 CBVC | 1.32 0.756570 SXKD | 1.31 0.766253 GIOITINH | 1.20 0.833903 lnCANHTACLUA | 1.19 0.843028 lnTHUYSAN | 1.15 0.870667 lnCAYLAUNAM | 1.08 0.922606 DANTOC | 1.05 0.955725 VAYVON | 1.04 0.965194 -+ -Mean VIF | 1.84 Kiểm định tượng phương sai thay đổi White's test for Ho: homoskedasticity against Ha: unrestricted heteroskedasticity chi2(128) = 169.04 Prob > chi2 = 0.0088 Cameron & Trivedi's decomposition of IM-test Source | chi2 df p -+ Heteroskedasticity | 169.04 128 0.0088 Skewness | 17.61 15 0.2838 Kurtosis | 12.30 0.0005 -+ Total | 198.95 144 0.0017 - Phụ lục 8: Kết mơ hình hiệu chỉnh Linear regression Number of obs F( 15, 1424) Prob > F R-squared Root MSE = = = = = 1440 56.72 0.0000 0.3926 6051 -| Robust lnTHUNHAP | Coef Std Err t P>|t| [95% Conf Interval] -+ -QUYMOHO | 2043526 0217329 9.40 0.000 1617206 2469845 TYLEPHUTHUOC | -.0037858 001058 -3.58 0.000 -.0058613 -.0017103 SLDLV | 1049482 0316331 3.32 0.001 0428957 1670007 SNDIHOC | 0153313 007751 1.98 0.048 0001267 0305359 DANTOC | 1327102 0535951 2.48 0.013 0275763 2378441 GIOITINH | 0327503 0417521 0.78 0.433 -.049152 1146526 TUOI | -.0015361 0016757 -0.92 0.359 -.0048232 0017509 HOCVAN | 0394192 0067062 5.88 0.000 0262642 0525742 NHANLUONG | -.1841372 039942 -4.61 0.000 -.2624886 -.1057858 SXKD | 0914623 0471944 1.94 0.053 -.0011158 1840404 CBVC | 3364172 0815931 4.12 0.000 1763617 4964727 VAYVON | -.0320539 0374205 -0.86 0.392 -.1054592 0413514 lnCANHTACLUA | 0070975 0033613 2.11 0.035 000504 0136911 lnCAYLAUNAM | 0133002 0048601 2.74 0.006 0037665 0228338 lnTHUYSAN | -.0054448 0040204 -1.35 0.176 -.0133313 0024417 _cons | 10.01305 1272225 78.71 0.000 9.763491 10.26262 Phụ lục 9: Kiểm tra tính vững kết -(1) (2) (3) (4) (5) (6) lnTHUNHAP lnTHUNHAP lnTHUNHAP lnTHUNHAP lnTHUNHAP lnTHUNHAP -QUYMOHO 0.2472*** 0.2105*** 0.2387*** 0.2044*** (0.0213) (0.0218) (0.0213) (0.0217) TYLEPHUTHUOC -0.0051*** (0.0010) -0.0042*** (0.0011) -0.0046*** (0.0010) -0.0038*** (0.0011) SLDLV 0.0240 (0.0304) 0.0997*** (0.0318) 0.0343 (0.0303) 0.1049*** (0.0316) SNDIHOC 0.0521*** (0.0045) 0.0167** (0.0078) 0.0513*** (0.0045) 0.0153** (0.0078) DANTOC 0.1698*** (0.0540) 0.1236** (0.0535) 0.1766*** (0.0540) 0.1327** (0.0536) GIOITINH 0.0294 (0.0411) 0.2404*** (0.0486) 0.0328 (0.0418) TUOI -0.0010 (0.0017) -0.0031* (0.0017) -0.0015 (0.0017) HOCVAN 0.0415*** (0.0067) 0.0552*** (0.0057) 0.0394*** (0.0067) NHANLUONG -0.2019*** (0.0390) -0.1980*** (0.0430) -0.1841*** (0.0399) SXKD 0.0658 (0.0452) 0.0776 (0.0538) 0.0915* (0.0472) CBVC 0.3217*** (0.0830) 0.2782*** (0.0910) 0.3364*** (0.0816) VAYVON -0.0122 (0.0447) -0.0335 (0.0385) -0.0321 (0.0374) lnCANHTACLUA 0.0237*** (0.0037) 0.0080** (0.0033) 0.0071** (0.0034) lnCAYLAUNAM 0.0162*** (0.0057) 0.0163*** (0.0049) 0.0133*** (0.0049) lnTHUYSAN 0.0041 (0.0046) -0.0082** (0.0040) -0.0054 (0.0040) _cons 10.0142*** 10.0176*** 10.9159*** 11.0619*** 9.9796*** 10.0131*** (0.0714) (0.1241) (0.1167) (0.0337) (0.0742) (0.1272) -N 1440 1440 1440 1440 1440 1440 adj R-sq 0.3393 0.3813 0.1372 0.0329 0.3481 0.3862 F 124.1211 75.3335 45.5341 14.2577 71.9271 56.7201 -Standard errors in parentheses * p