When the high speed of the pandemic are likely to increase the linear valuation can be the cause of the outbreak of crisis (critical threshold) = 0.50 value crisis = 4 days, and when the crisis occurs, value = 0.70 = 5 days.
The high speed of the outbreak is likely higher linear. This can cause an outbreak of the crisis (critical threshold) when = 0.50 = four days caused the crisis and the crisis that occurred when = 0.70 = five days.
When the high speed of the outbreak is likely to rise as linear. Which can find the critical value that caused the outbreak (critical threshold) = 0.50's critical value = 4 days and when = 0.70's critical value. = 5 day .