Appendix
Declare the panel data
. xtset ma_thue year
panel variable: ma_thue (strongly balanced)
time variable: year, 2015 to 2019
delta: 1 unit
Descriptive statistics of quantitative variables
. sum pro tech lb k pci
Variable | Obs Mean Std. Dev. Min Max
-------------+---------------------------------------------------------
pro | 11,760 718.8671 2286.359 0 83156.84
tech | 11,535 35406 422862.8 10.2 1.93e+07
lb | 11,760 377.7542 1088.935 2 29132
k | 7,056 231236.3 765459.1 118.5 2.27e+07
pci | 11,760 62.65847 4.02894 48.96 73.4
Descriptive statistics of qualitative variables
. tab inno
1:yes, 0:No | Freq. Percent Cum.
------------+-----------------------------------
0 | 5,509 46.85 46.85
1 | 6,251 53.15 100.00
------------+-----------------------------------
Total | 11,760 100.00
. tab rd
1: có |
hoạt |
động |
R&D; |
0:không |
có hoạt |
động R&D | Freq. Percent Cum.
------------+-----------------------------------
0 | 11,043 94.15 94.15
1 | 686 5.85 100.00
------------+-----------------------------------
Total | 11,729 100.00
. tab cx
cx | Freq. Percent Cum.
------------+-----------------------------------
0 | 1,322 11.24 11.24
1 | 10,438 88.76 100.00
------------+-----------------------------------
Total | 11,760 100.00
. tab fdi
DN có |
vốn |
nước |
ngoài | Freq. Percent Cum.
------------+-----------------------------------
0 | 4,354 61.71 61.71
1 | 2,702 38.29 100.00
------------+-----------------------------------
Total | 7,056 100.00
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