Environmental Efficiency Evaluation Method Based on Data Envelopment Analysis and Improved Neural Network

Table 1

Data and variables.

The first stage		The second stage
Input variable	Output variables	Input variable	Output variables
Environmental efficiency funds	Turnover of technology market	Number of scientific and technological personnel per 10000 people	DEA efficiency value
Environmental expenditure	Number of invention patents	Proportion of environmental expenditure in environmental efficiency expenditure
Environmental scientists and engineers	Number of utility model and design patents	Proportion of scientists and engineers in scientific and technological personnel
Environmental scientists and engineers	Number of papers included in SCI	Proportion of environmental scientists and engineers in environmental personnel
	Number of papers included in EI
	Number of papers included in ISTP