Kantar monitors smartphone market shares throughout the world on a three month rolling average.

FORBES: iPhone Gaining Share in Urban China, Ebbing and Flowing in Europe and Losing Share in Japan

Mr Romney is now ahead, by 1.5%, in the RealClearPolitics rolling average of all polls.

ECONOMIST: Lexington

Market volatility can be countered by basing payouts, say, on a three-year rolling average of portfolio value.

FORBES: In growth we trust

The latest polls show Mr Romney trailing Mr Obama by 1.5%, according to RealClearPolitics, a website which calculates a rolling average.

ECONOMIST: Mitt Romney��s chances

The four-week rolling average for the week fell 2, 250 to 350, 500.

FORBES: Weekly Market Wrap

Lord Bew recommends a three-year "rolling average" of performance be published.

BBC: School Sats review: Lord Bew calls for more creativity

Based on the 3-month rolling average that WSTS (the World Semiconductor Trade Statistics) uses November sales were the highest month of the year and the first month of 2012 to come in higher than the same month of 2011.

FORBES: Future Tech

Using three-year rolling-average performance as a measure, he discovered that, of the funds that beat the average for six consecutive years, only just over half did so again the year after.

ECONOMIST: Fund management

Gent predicted the state will sustain an average of 15 hours of rolling blackouts a week throughout the summer.

CNN: graphic

The table below is a summary of the rolling returns for each scenario, showing average returns as well as best and worst returns for one-month, one-year, three-year and five-year periods.

FORBES: Magazine Article

With an eye for telling detail, he notes that the players of the Berlin Philharmonic are, on average, a generation younger than the members of the Rolling Stones.

ECONOMIST: Essays by the New Yorker's music critic