COVID-19: NZ & AU Open Border - Risk Assessment (pt 1/2)

There are ongoing discussions across both New Zealand & Australia about relaxing border controls between the two countries given their current COVID19 status.
Point of Maximum risk is taken as the Peak of the 2 Sigma Upper Bollinger Band
Current risk is taken as the (Current Upper Bollinger Band) / (Peak Upper Bollinger Band)

NZ risk level = 8%
AU risk level =10%

Open Border Risk = SQRT(0.08*0.10)= 9% Risk
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Declinazione di responsabilità