Author: Shanlang Lin; Yanning Qiao; Junpei Huang; Na Yan
Title: Research on the Influence of Effective Distance Between Cities on the Cross-regional Transmission of COVID-19 Document date: 2020_3_30
ID: dxtbp4kd_59
Snippet: (2) PPML method. Silva & tennero (2006) pointed out that if there is an option of heteroscedasticity or zero value (due to the fact that the number of initial case in many cities is zero), Poisson maximum likelihood model (PPML) should be used to test the robustness......
Document: (2) PPML method. Silva & tennero (2006) pointed out that if there is an option of heteroscedasticity or zero value (due to the fact that the number of initial case in many cities is zero), Poisson maximum likelihood model (PPML) should be used to test the robustness.
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