Fig. 2: Comparison of core explanatory variable coefficients in four sample regressions about technology improvement mechanism.
From: How does inter-provincial trade promote economic growth? Empirical evidence from Chinese provinces
This figure compares core explanatory variable (lntrade) coefficients under the Entirety, East, Middle, and West regressions in the empirical test of technology improvement mechanism. The vertical axis shows the magnitude, plus or minus of the coefficients of the core explanatory variables, and the value 0 is indicated by a dotted line as the cut-off point for positivity. The horizontal coordinate represents the four different groups, and we use four different colors here for easy observation. The four points are the values of the core explanatory variables in the corresponding four sets of regressions, and the confidence interval is 95%. Among them, the coefficient of core explanatory in the Entirety, Middle, and West is positive, while the coefficient of core explanatory variable in the East is negative. The four values in descending order are West, Middle, Entirety, and East. This reveals that the technology improvement, as an intermediary mechanism for inter-provincial trade to promote economic growth, is established in the overall, middle, and western regions, but not in eastern region.
