Fig. 22.

Comparison of curves for Sardegna region. Left: y–axis on normal scale, right: on logarithmic scale. Regression line shown for $log(\mathrm{daily}\mathrm{confirmed})-log(\mathrm{daily}\mathrm{tested})\sim time$ with $95\%$ prediction band. Slope of regression with $95\%$ confidence interval: $a_{\mathrm{f}}=-0.092(-0.105,-0.078)$, this corresponds to a half-life (in days) of 7.573(6.599, 8.884). The slope of the regression $log(\mathrm{daily}\mathrm{confirmed})\sim time$ is $a_{\mathrm{raw}}=-0.058(-0.072,-0.044)$ corresponding to a half-life (in days) of 11.902(9.603, 15.649). The slope of the regression $log(\mathrm{daily}\mathrm{tests})\sim time$ is 0.031(0.023, 0.026) corresponding to a doubling time (in days) of 22.193(26.372, 30.382). Ratio of slopes for $a_{\mathrm{f}}/a_{\mathrm{raw}}=1.572$, with corresponding half-lives’ ratio: 0.636. The slope of the regression $log(\mathrm{cumulative}\mathrm{confirmed})-log(\mathrm{cumulative}\mathrm{tested})\sim time$ is $-0.030(-0.031,-0.028)$ corresponding to a half-life (in days) of 23.310(22.147, 24.602)