1. Observed cases up to \(t\) are analyzed for all possible values of the window size \(\left(m\in\left[1,m_{\max}\right]\right)\) and threshold \(\left(c\in\left[0,1\right]\right)\)
  2. For each of the \(m\ and\ c\) combinations, the \(Se_{t_{m,c}}\)and \(Sp_{t_{m,c}}\)are estimated for the predefined case definition (Eq. 4). 
  3. The  \(m'\) and \(c'\) that give the best \(Se_{t_{m',c'}}\) and \(Sp_{t_{m',c'}}\) combination are selected.
  4. For \(m'\) and \(c'\), the value of \(Ind_{EVI_{t,t-1}}\) is determined at the most recent time point \(t\) and a decision is made on whether or not a warning signal is issued.