Moving average
A moving average is the mean of the last few values in a series, recomputed as each new value arrives, so that a noisy daily figure becomes a readable line. IZeat's period summary draws weekly averages beyond a month and monthly averages beyond a year, each over recorded days only, which is a moving average with the gaps left honest.
The choice that matters in a moving average is what to do with a missing day. Counting it as zero drags the line down and rewards not logging; IZeat divides by recorded days and shows their number, so an average over five logged days is labelled as such. Daily rows are kept through thirty-one days, then weekly means, then monthly, and the target timeline stays drawn beside them.
Averages are how a record becomes advice without anyone giving it: a customer who sees their weekly means drift up over a quarter needs no lecture. That is the kind of neutrality IZeat aims at, the fact shown plainly and the conclusion left to the person. The gap shown as a gap is the small honesty that makes the line trustworthy.
Put it into practice: Reading a period.
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