The figures displayed in the Custom Attendance Report and the Percentage Attendance Between Report sometimes shows a slight variance in percentages due to the different way the reports calculate the figures. It's usually less than 1% but has been known to be up to 1.5% different.
The Percentage Attendance Between Report works out the figures per student and then averages the total percentages. So, it calculates:
Sessions Attended/Possible Sessions (x 100 to create the individual student's Attendance %). The report then adds up all the Attendance % and divides by the total number of students in the report for overall Attendance %.
The Custom Attendance Report works the attendance as a whole, so adds up all the sessions for everyone.
Sessions Attended total/Possible Sessions total (x 100 to create the overall Student Attendance % in the report).
In the example below the two reports display a 0.01% difference in Attendance %.
The Percentage Attendance Between Report displays:
Attendance % - 98.55% Authorised Lates % - 0.15%
Unauthorised Absence % - 0.75% Authorised Lates % - 0.03%
Authorised Absence % - 0.7%
whilst the Custom Attendance Report for the same date displays:
Attendance % - 98.54% Authorised Lates % - 0.16%
Unauthorised Absence % - 0.75% Authorised Lates % - 0.03%
Authorised Absence % - 0.7%