Attendance
Maximum absences allowed by a threshold
The number of missed days a given attendance threshold permits. At 90% over 180 days, 180 x 0.1 = 18 absences are tolerated.
The Formula
maxAbsences = possible x (1 - threshold)
The number of missed days a given attendance threshold permits. At 90% over 180 days, 180 x 0.1 = 18 absences are tolerated.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| t | Minimum attendance rate required | ratio | Expressed as a decimal, so a 90% policy is 0.90. Multiplying it by the enrolled days gives the days that must be attended. |
| A_max | Maximum absences allowed | days | 180 - 0.90 x 180 = 18. Beyond this number of missed days the threshold is breached. |
What Each Symbol Means
tratio
Minimum attendance rate required
Expressed as a decimal, so a 90% policy is 0.90. Multiplying it by the enrolled days gives the days that must be attended.
A_maxdays
Maximum absences allowed
180 - 0.90 x 180 = 18. Beyond this number of missed days the threshold is breached.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate an attendance rate page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate An Attendance Rate, filed under Education. Every number the guide produces comes from substituting into this one line.