Tracking the national and regional COVID-19 epidemic status in the UK using weighted principal component analysis

  title={Tracking the national and regional COVID-19 epidemic status in the UK using weighted principal component analysis},
  author={Ben Swallow and Wenhan Xiang and Jasmina Panovska-Griffiths},
  journal={Philosophical transactions. Series A, Mathematical, physical, and engineering sciences},
One of the difficulties in monitoring an ongoing pandemic is deciding on the metric that best describes its status when multiple intercorrelated measurements are available. Having a single measure, such as the effective reproduction number R, has been a simple and useful metric for tracking the epidemic and for imposing policy interventions to curb the increase when R>1. While R is easy to interpret in a fully susceptible population, it is more difficult to interpret for a population with… 

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