| Index | Variable description | Sign |
Explained variable | Collaborative order | Order degree of electronic and communication equipment manufacturing subsystem and synergy degree of composite system | Ln CD |
Explanatory variable | Economic development level | Per capita GDP | Ln PGDP |
Government support | Government funds in internal expenditure of R & D funds | Ln GS | |
Market activity | Technology market turnover | Ln TMT | |
Innovation ability | Innovation efficiency | Ln IE |