Figure 1
A line graph depicts the coefficient beta estimated value over a policy time point. The horizontal axis represents the policy time point ranging from -2 to 11. The vertical axis represents the coefficient beta estimated value ranging from -0.1 to 0.1. The graph shows a series of data points connected by a line, with error bars indicating the variability of the data. The data points start at a value slightly above 0 at the policy time point -2, then decrease gradually over time, reaching a value slightly below -0.05 at the policy time point 11. The error bars vary in length, indicating different levels of uncertainty at each data point. The overall trend shows a decline in the coefficient beta estimated value as the policy time point increases.Common trend test chart