Table 4.1 shows examples of different kinds of interval specifications.
Table 4.1: Examples of Intervals
|
Name |
Description of Interval |
|
YEAR |
Years that start in January |
|
YEAR.10 |
Years that start in October |
|
YEAR2.7 |
Biennial intervals that start in July of even years |
|
YEAR2.19 |
Biennial intervals that start in July of odd years |
|
YEAR4.11 |
Four-year intervals that start in November of leap years (frequency of U.S. presidential elections) |
|
YEAR4.35 |
Four-year intervals that start in November of even years between leap years (frequency of U.S. midterm elections) |
|
YEARV |
Years that start on the Monday on or immediately preceding January 4th |
|
YEARV.2 |
Years that start on the Monday immediately following January 4th |
|
R445MON |
Months that start on the 1st, 5th, 9th, 14th, 18th, 22nd, 27th, 31st, 35th, 40th, 44th, and 48th Monday of the year. The 1st Monday is the Monday on or immediately preceding January 4th |
|
R445MON3 |
Three-month intervals that start on the 1st, 14th, 27th, and 40th Monday of the year. This is equivalent to R445QTR |
|
R445MON3.2 |
Three-month intervals that start on the 5th, 18th, 31th, and 44th Monday of the year. This is equivalent to R445QTR.2 |
|
WEEK |
Weekly intervals that start on Sundays |
|
WEEK2 |
Biweekly intervals that start on first Sundays |
|
WEEK1.1 |
Same as WEEK |
|
WEEK.2 |
Weekly intervals that start on Mondays |
|
WEEK6.3 |
Six-week intervals that start on first Tuesdays |
|
WEEK6.11 |
Six-week intervals that start on second Wednesdays |
|
WEEKDAY |
Daily with Friday-Saturday-Sunday counted as the same day (five-day work week with a Saturday-Sunday weekend) |
|
WEEKDAY17W |
Same as WEEKDAY |
|
WEEKDAY5.2 |
Five weekdays that start on Monday. If WEEKDAY data are accumulated into weekly data, the interval of the accumulated data is WEEKDAY5.2 |
|
WEEKDAY67W |
Daily with Thursday-Friday-Saturday counted as the same day (five-day work week with a Friday-Saturday weekend) |
|
WEEKDAY1W |
Daily with Saturday-Sunday counted as the same day (six-day work week with a Sunday weekend) |
|
WEEKDAY3.2 |
Three-weekday intervals (with Friday-Saturday-Sunday counted as one weekday) with the cycle three-weekday periods aligned to Monday, January 4, 1960 |
|
HOUR8.7 |
Eight-hour intervals that start at 6 a.m., 2 p.m., and 10 p.m. (might be used for work shifts) |