Regression code for: Quantity-quality trade-off in Northeast China during the Qing dynasty

The CMGPD-LN data that support the findings of this study are available in ICPSR with the identifier https://doi.org/10.3886/ICPSR27063.v10.本研究结论所依托的CMGPD-LN数据集可于ICPSR获取，其标识符为https://doi.org/10.3886/ICPSR27063.v10。