After analysing the obvious provincial population differences, this chapter studies the degree of correlation between the implementation time of the selective two-child policy and the necessity of family planning policy adjustment, which is calculated in Chap. 7, and conducts spatial aggregation analysis. Then, this chapter uses the provincial population number as the weight to calculate the
... [Show full abstract] overall degree of rationality of implementing the selective two-child policy. The results show that Shanghai Province suitably implements the selective two-child policy with the highest degree of correlation and that Jiangxi Province improperly implements the family planning policy with the lowest degree of correlation. When considering all the influencing factors, the degrees of correlation of Shanghai Province and Jiangxi Province are 0.93709 and 0.31425, respectively. When considering only the population-related influencing factors, the degrees of correlation of Shanghai Province and Jiangxi Province are 0.95368 and 0.35088, respectively. In the spatial aggregation analysis, the north-east provinces have relatively high degrees of correlation. When adjusting their family planning policies, most provinces have considered their population factors but have overlooked their economic and social factors. When considering all the influencing factors or only the population-related influencing factors, the overall degrees of correlation for China as a whole are 0.64207 and 0.70159, respectively. The overall score is relatively high but still has high room for improvement. In the future, the entire public should continue to pay attention to the provincial population differences when adjusting the family planning policy.