Differences in tourism economic development and its influencing factors among three major city clusters along the middle reaches of the Yangtze River.

ctions(Z 1 ), regional GDP(Z 2 ), the proportion of tertiary industry(Z 3 ), number of star hotels(Z 4 ) and number of travel agencies(Z 5 ); Y is the dependent variable, which refers to the comprehensive score F of the evaluation of tourism economic development level. And the regression effect was highly significant in the ANOVA ( Table 6 ).

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The per capita density of city clusters ( Fig 5 ) showed a trend of "competing development", with Wuhan city circle maintaining first place before 2015, and then the Poyang Lake ecological economic zone surpassed and widened the gap.

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