Protective Policy Index (PPI) global dataset of origins and stringency of COVID 19 mitigation policies by Olga Shvetsova, Andrei Zhirnov, Abdul Basit Adeel, Mert Can Bayar, Onsel Gurel Bayrali, Michael Catalano, Olivia Catalano, Hyoungrohk Chu, Frank Giannelli, Ezgi Muftuoglu, Dina Rosenberg, Didem Seyis, Bradley Skopyk, Julie VanDusky-Allen, Tianyi Zhao

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