[Retracted] Can European Union (EU) Enlargement Boost Regional Economic Common Growth? Multi-Period Difference-in-Difference (DID) Method

Table 1

Variable selection and description.

Variable	Variable description
Lnpergdp	The log of real GDP per capita at PPP (constant 2000 prices)
Membership	A dummy variable that equals one in the years when states joining the EU and equals zero otherwise
Eld	Heritage Foundation index of economic freedom
Tech	Medium and high technology manufactured goods value (% of manufactured exports)
Gov	General government consumption expenditure (% of GDP)
Second	Value added in the secondary industry(% of GDP)
Urban	The population lives in urban (% of the total population)