Fig. 27.

Comparison of curves for Veneto 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: $a_{\mathrm{f}}=-0.059(-0.065,-0.053)$, this corresponds to a half-life (in days) of 11.693(10.592, 13.049). The slope of the regression $log(\mathrm{daily}\mathrm{confirmed})\sim time$ is $a_{\mathrm{raw}}=-0.047(-0.054,-0.040)$ corresponding to a half-life (in days) of 14.843(12.879, 17.513). The slope of the regression $log(\mathrm{daily}\mathrm{tests})\sim time$ is 0.013(0.007, 0.026) corresponding to a doubling time (in days) of 55.100(26.467, 95.637). Ratio of slopes for $a_{\mathrm{f}}/a_{\mathrm{raw}}=1.269$, with corresponding half-lives’ ratio: 0.788. The slope of the regression $log(\mathrm{cumulative}\mathrm{confirmed})-log(\mathrm{cumulative}\mathrm{tested})\sim time$ is $-0.016(-0.017,-0.016)$, corresponding to a half-life (in days) of 42.325(40.947, 43.799)