Fig. 10.

Comparison of curves for Campania 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: $a_{\mathrm{f}}=-0.087(-0.094,-0.079)$ ,this corresponds to a half-life (in days) of 7.998(7.376, 8.734). The slope of the regression $log(\mathrm{daily}\mathrm{confirmed})\sim time$ is $a_{\mathrm{raw}}=-0.055(-0.062,-0.047)$ corresponding to a half-life (in days) of 12.707(11.155, 14.762). The slope of the regression $log(\mathrm{daily}\mathrm{tests})\sim time$ is 0.032(0.027, 0.032) corresponding to a doubling time (in days) of 21.580(21.771, 25.624). Ratio of slopes for $a_{\mathrm{f}}/a_{\mathrm{raw}}=1.589$, with corresponding half-lives’ ratio: 0.629. The slope of the regression $log(\mathrm{cumulative}\mathrm{confirmed})-log(\mathrm{cumulative}\mathrm{tested})\sim time$ is $-0.031(-0.032,-0.030)$ corresponding to a half-life (in days) of 22.438(21.964, 22.933)