Time frequencies
Time frequencies are simple integer values that represent the number of time
periods within a year, plus two special frequencies: a so-called "integer"
frequency (for simple numbered observations without relation to calendar time),
and a representation for unknown or unspecified frequencies. For convenience,
the Frequency enum provides a set of predefined names for all the time
frequencies available.
The Frequencies are classified into regular and
irregular frequencies. Regular frequencies are those that are evenly spaced
within a year no matter the year, while irregular frequencies are those that
vary in the number of periods within a year due to human calendar conventions
and irregularities.
| Integer value | Frequency enum |
Regular | Description |
|---|---|---|---|
| 1 | irispie.YEARLY |
Yearly frequency | |
| 2 | irispie.HALFYEARLY |
Half-yearly frequency | |
| 4 | irispie.QUARTERLY |
Quarterly frequency | |
| 12 | irispie.MONTHLY |
Monthly frequency | |
| 52 | irispie.WEEKLY |
Weekly frequency | |
| 365 | irispie.DAILY |
Daily frequency | |
| 0 | irispie.INTEGER |
Integer frequency (numbered observations) | |
| -1 | irispie.UNKNOWN |
Unknown or unspecified frequency |
The most often direct use of Frequencies in frequency conversion methods, such
as aggregate and disaggregate for time Series and whenever a
custom check of time period or time series properties is needed.