formal and informal aspects. Formal Environmental
Regulation (ER). Calculated as follows:
*
it
it
it
ER
ER
R
=
Among them, ER
it
*
is the ratio of industrial
pollution control investment to gross industrial output
value, and R
it
is the ratio of gross industrial output
value to regional GDP. The larger the ER
it
value, the
greater the intensity of formal environmental
regulation in the region.
Informal Environmental Regulation (INER).
Referring to the research of Wheeler and Pargal
(1996), the indicators of income level, education
level, and population density were selected, and the
entropy weight method was used to combine the three
indicators into one indicator to represent informal
environmental regulation variables.
Controls: Referring to existing research, the
regional economic development level (PGDP),
government intervention (GOV), human capital
(HUM) and transportation infrastructure level
(ROAD) were used as control variables in this study.
The specific meaning of each control variable
indicator: the per capita GNP of each province is used
to reflect the regional economic development level,
and the logarithm is used to process it; the ratio of
government fiscal expenditure to regional GDP is
used to measure government intervention; the
average education years of each province is used to
express Human capital; the ratio of the mileage of
railways and highways in each province to the
provincial area is used to represent the level of
transportation infrastructure.
Most of the sample data mentioned above can be
obtained from the 2012-2021 China Industrial
Statistical Yearbook, the China Science and
Technology Statistical Yearbook, the China Statistical
Yearbook, the 2012-2020 China Environmental
Statistical Yearbook, and China 30 Statistical
yearbook query for each province (because of the
limited availability of relevant data in Tibet and Hong
Kong and Macao), and use interpolation method to
supplement individual missing values in the data. The
data of the price variables involved are uniformly
based on 2011 Flatten. Table 1 shows the descriptive
statistics of the main variables.
Table 1: Descriptive statistics.
Variable N Average SD Min Max
Green 300 1.316 0.263 0.831 2.358
ER 300 1.226 1.437 0.041 8.163
INER 300 0.17 5 0.171 0.038 0.943
lnT 300 14.087 1.460 10.619 16.96
GOV 300 0.250 0.103 0.110 0.643
lnPGDP 300 10.841 0.436 9.705 12.013
HUM 300 0.360 0.254 0.135 1.716
ROAD 300 11.711 0.840 9.441 12.898
Table 2 reports the test results of repeated sampling
using the Bootstrap method for 1000 times. It can be
seen that when ER is used as the threshold variable,
the F values of the single threshold and the double
threshold have passed the 1% significance test,
indicating that with the increase of ER intensity ,
there is a double threshold effect with threshold
values of 0.8900 and 2.2261 between technological
innovation and manufacturing green transformation;
When INER is used as the threshold variable, the F
values of single threshold and double threshold have
passed the 5% significance test, indicating that with
the increase of INER, there is a double threshold
value of 0.0693 and 0.5255 between technological
innovation and manufacturing green transformation.
threshold effect; When CossER is used as the
threshold variable, only the F value of a single
threshold passes the 1% significance test, indicating
that as the intensity of CossER increases, there is a
single threshold effect with a threshold value of
0.0986 between technological innovation and
manufacturing green transformation.