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Fig. 3 | BMC Medicine

Fig. 3

From: The impact of non-pharmaceutical interventions on SARS-CoV-2 transmission across 130 countries and territories

Fig. 3

Dendrogram from the hierarchical cluster analysis of NPI time-series by scenario. The height of the node connecting two NPIs on the dendrogram represents the degree of similarity between their time-series. For example, under the Maximum Effort Scenario, the time-series of “restrictions on internal movement” is more similar to that of “restrictions on gatherings” (linked at point A), compared to that of “close public transport” (linked at point B). The hierarchical clustering analysis relies on Ward’s method and Euclidean distances. The colour of the text boxes corresponds to the group each NPI is in; red dashed boxes indicate statistically significantly temporal clusters identified through bootstrapping.

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