Synergetic Development Measure of Airport Groups Composite System and Its Influencing Factors Analysis: Some Evidence from China

Figure 4

Composite system change speed value and the change speed state value. (a) The change speed value. (b) The change speed state value. (The years of the vertical coordinates of (a) and (b) in Figure 4, 2014 indicates 2013-2014, 2015 indicates 2014-2015, and so on).

(a)

(b)