4 ms·
Can anyone explain why the base period is 29 years but then they step forward by 10 years? Seems kind of arbitrary and when these types of things are arbitrary
by IanDrake 9y ago
Can anyone explain why the base period is 29 years but then they step forward by 10 years?
Seems kind of arbitrary and when these types of things are arbitrary I wonder what alternative time frames with the same data might look like.
- TomSawyer 9y agoThis is the best answer to that, that I've seen: https://twitter.com/corbettmatt/status/891003236412469248 https://twitter.com/corbettmatt/status/891003236412469248
- cbcoutinho 9y agoTo my understanding it's a thirty year baseline - beginning Jan '51 to end Dec ' 80 (inclusive) is thirty years.