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PHỤ LỤC
Phụ lục 4.2a: Kết quả mô hình lợi nhuận biên ngẫu nhiên
. xtfrontier ln_profit ln_cost_labor ln_area ln_cost_labor_2 ln_area_2 c.ln_cost_labor#c.ln_area i.year, ti ite
> rate(20) showtolerance
Number of obs = | 2910 | ||
Group variable: id | Number of groups = | 1725 | |
Obs per group: | min = | 1 | |
avg = | 1.7 | ||
max = | 3 | ||
Wald chi2(7) | = | 3150.58 | |
Log likelihood = -2852.8981 Prob > chi2 | = | 0.0000 | |
Có thể bạn quan tâm!
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Kết Quả Ước Lượng Các Tác Động Đến Hiệu Quả Sản Lượng -
Tóm Tắt Chiều Tác Động Của Các Yếu Tố Đến Hiệu Quả Và Năng Suất Nông Nghiệp -
Aigner, D., Lovell, K. And Schmidt, P. (1977), ‘Formulation And Estimation Of Stochastic Frontier Production Function Models’, Journal Of Econometrics, Vol. 6 No. 1, Pp. 21-37. -
Tác động của quyền sử dụng đất nông nghiệp lên hiệu quả sản xuất nông nghiệp Việt Nam - Tiếp cận bằng các mô hình toán kinh tế - 18 -
Tác động của quyền sử dụng đất nông nghiệp lên hiệu quả sản xuất nông nghiệp Việt Nam - Tiếp cận bằng các mô hình toán kinh tế - 19
Xem toàn bộ 155 trang tài liệu này.
Coef. | Std. Err. | z | P>|z| | [95% Conf. | Interval] | |
ln_cost_labor ln_area ln_cost_labor_2 ln_area_2 c.ln_cost_labor#c.ln_area year 2016 2018 _cons | 2.572721 | .1942055 | 13.25 | 0.000 | 2.192085 | 2.953357 |
2.093846 | .2320466 | 9.02 | 0.000 | 1.639043 | 2.548649 | |
241.076 | 23.43146 | 10.29 | 0.000 | 195.1512 | 287.0009 | |
-1.671533 | 17.43653 | -0.10 | 0.924 | -35.84651 | 32.50344 | |
-.1840739 | .019856 | -9.27 | 0.000 | -.2229909 | -.1451569 | |
.1488139 | .0268339 | 5.55 | 0.000 | .0962204 | .2014074 | |
-.0080954 | .0281964 | -0.29 | 0.774 | -.0633593 | .0471684 | |
-20.49533 | 2.489052 | -8.23 | 0.000 | -25.37378 | -15.61688 | |
/mu | -88.90116 | 37.64318 | -2.36 | 0.018 | -162.6804 | -15.12187 |
/lnsigma2 | 3.552571 | .417946 | 8.50 | 0.000 | 2.733412 | 4.37173 |
/lgtgamma | 4.728761 | .4247764 | 11.13 | 0.000 | 3.896215 | 5.561308 |
sigma2 | 34.90294 | 14.58755 | 15.38529 | 79.18052 | ||
gamma | .99124 | .0036884 | .980086 | .996171 | ||
sigma_u2 | 34.59719 | 14.58806 | 6.005118 | 63.18927 | ||
sigma_v2 | .3057496 | .0106281 | .284919 | .3265802 |
Phụ lục 4.2b: Kiểm định sự phù hợp của hàm lợi nhuận và các thông số hiệu quả
1. Kiểm định sự tồn tại của phi hiệu quả kĩ thuật
𝐻0: 𝜇 = 0
𝐻1: 𝜇 ≠ 0
Tiêu chuẩn kiểm định là thống kê: 𝑡 = 𝜇̂
𝑠𝑒(𝜇̂)
t_statistic = -2,36 , p_value = 0,018
Như vậy, có tồn tại phi hiệu quả trong mô hình
2. Kiểm định có sự tác động của phi hiệu quả lên lợi nhuận
𝐻0: 𝛾 = 0
𝐻1: 𝛾 ≠ 0
Tiêu chuẩn kiểm định là thống kê: 𝐿𝑅 = −2[𝑙𝑛𝐿(𝐻0) − 𝑙𝑛𝐿(𝐻1)]
Trong đó 𝑙𝑛𝐿(𝐻0) là giá trị log likelihood của mô hình không tồn tại phi hiệu quả lợi nhuận và 𝑙𝑛𝐿(𝐻1) là giá trị log likelihood của mô hình tồn tại phi hiệu quả lợi nhuận.
Ta có: Wald chi2(7) = 3150,58, P_value = 0,000
Như vậy có sự tác động của phi hiệu quả đến lợi nhuận.
Phụ lục 4.2c: Kết quả mô hình lợi nhuận biên ngẫu nhiên
. xtfrontier ln_cost1 ln_labor_cost ln_giadat y_hieuchinh i.year, ti iterate(20) showtolerance
Number of obs = | 2934 | ||
Group variable: id | Number of groups = | 1737 | |
Obs per group: | min = | 1 | |
avg = | 1.7 | ||
max = | 3 | ||
Wald chi2(5) | = | 7713.66 | |
Log likelihood = -1317.7088 Prob > chi2 | = | 0.0000 | |
Coef. | Std. Err. | z | P>|z| | [95% Conf. | Interval] | |
ln_labor_cost ln_giadat y_hieuchinh year 2016 2018 _cons | .4395241 | .045204 | 9.72 | 0.000 | .3509259 | .5281223 |
.1221119 | .0165072 | 7.40 | 0.000 | .0897585 | .1544653 | |
.8792512 | .0107283 | 81.96 | 0.000 | .8582242 | .9002782 | |
-.289663 | .0159003 | -18.22 | 0.000 | -.3208269 | -.258499 | |
-.1807347 | .015227 | -11.87 | 0.000 | -.2105792 | -.1508903 | |
1.828509 | 19.65117 | 0.09 | 0.926 | -36.68707 | 40.34409 | |
/mu | 1.988866 | 19.64976 | 0.10 | 0.919 | -36.52396 | 40.50169 |
/lnsigma2 | -1.825658 | .0295029 | -61.88 | 0.000 | -1.883483 | -1.767833 |
/lgtgamma | -.1249037 | .1042257 | -1.20 | 0.231 | -.3291823 | .0793748 |
sigma2 | .1611116 | .0047533 | .1520596 | .1707024 | ||
gamma | .4688146 | .0259551 | .4184396 | .5198333 | ||
sigma_u2 | .0755315 | .0055795 | .0645958 | .0864671 | ||
sigma_v2 | .0855801 | .0037453 | .0782394 | .0929208 |