Fig. 13.

Comparison of curves for Lazio 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: $a_{\mathrm{f}}=-0.047(-0.064,-0.030)$, this corresponds to a half-life (in days) of 14.740(10.854, 22.960). The slope of the regression $log(\mathrm{daily}\mathrm{confirmed})\sim time$ is $a_{\mathrm{raw}}=-0.039(-0.047,-0.032)$ corresponding to a half-life (in days) of 17.554(14.679, 21.828). The slope of the regression $log(\mathrm{daily}\mathrm{tests})\sim time$ is $0.008(-0.007,0.017)$. Ratio of slopes for $a_{\mathrm{f}}/a_{\mathrm{raw}}=1.191$, with corresponding half-lives’ ratio: 0.840. The slope of the regression $log(\mathrm{cumulative}\mathrm{confirmed})-log(\mathrm{cumulative}\mathrm{tested})\sim time$ is $-0.021(-0.022,-0.020)$ corresponding to a half-life (in days) of 32.935(32.015, 33.910)