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  Indian J Med Microbiol
 

Figure 5: (A) Estimated total number of COVID-19 cases and its quantile function in Hong Kong and (B) the probability density function (PDF) and cumulative density function (CDF) of the time for the total number of COVID-19 cases in Hong Kong. The EWMA control chart for monitoring a COVID-19 outbreak in Hong Kong: The expected value and variance estimated via (C) the delta method and (D) the sample mean and variance method. FHT: First hitting time; λ: Smoothing parameter. UCL: Upper control limit; CL: Center line; LCL: Lower control limit.

Figure 5: (A) Estimated total number of COVID-19 cases and its quantile function in Hong Kong and (B) the probability density function (PDF) and cumulative density function (CDF) of the time for the total number of COVID-19 cases in Hong Kong. The EWMA control chart for monitoring a COVID-19 outbreak in Hong Kong: The expected value and variance estimated <i>via</i> (C) the delta method and (D) the sample mean and variance method. FHT: First hitting time; λ: Smoothing parameter. UCL: Upper control limit; CL: Center line; LCL: Lower control limit.