Biology Reference
In-Depth Information
BOX 2: HOW TO CALCULATE TIMELINESS—ABERRATION DETECTION
1.
Construct a time series for each data source
b. Plot the frequency (number of cases) on the y-axis
c. Plot time on the x-axis. Time can be recorded by day, date, month, etc.
A
B
Time
2.
Apply a detection algorithm to each time series
3.
Identify the first date of alert in each time series
B
Time
Alert A
Alert B
4.
Calculate the time difference between the alerts in each data source
d. Timeliness A = day (alert B) - day (alert A)
