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ARCH

Autoregressive Conditional Heteroskedasticity

A statistical measure of the average error between a best fit line and actual data that uses past data to predict future performance. General Autoaggressive Conditional Heteroskedasticity is the most common way of doing this. See also: Fractal Distribution.
References in periodicals archive ?
It's so archly conventional that it sends up its own sentimentality and simplicity.
A part of the International Monetary Fund's efforts to increase fiscal transparency in the severely corrupt and oligarchic dominated economy, the archly resented law was essentially imposed on the political system and on the Ukrainian parliament by its Western partners.
Support on this latest leg of the tour comes from Jonathan Mayor, who arrived on stage at the Auditorium like a camp genie let out of a panto lamp before Christmas, and who warmed up the crowd with archly amusing tales of his adoptive parents and growing up in '70s Yorkshire..
The setting is exotic--Greenland some 250 years ago--but despite the formal, sometimes archly "authentic" style, the vitality of the writing bridges distance in time and place.
It was at the Arena, for a start - referred to archly at one point as "your romantic concert hall".
e boys bend the old Western swing sound - North East swing they've called it - and manage to incorporate some gypsy-jazz, hokum, country and early blues all delivered with some archly original lyrics.
If you're crafty you will find imaginative supplies here; for those of us not so crafty, there are vintage games, archly humorous cards, leather tote bags and wallets.
Lynch's artistic output resonates with his Hollywood alms, archly evoking the mysterious in the familiar, the body in unlikely configuration with "organic phenomena," and "the home" as a site triggering flashbacks and nightmares.--Thomas Devaney
"A recent, if informal, Internet poll listed him as America's worst commander," the author points out archly. "Benedict Arnold was second." Basic.
The wire somewhat archly noted that Khamenei's comments came "during a meeting with the visiting Kuwaiti Emir Sheikh Sabah al-Ahmad Al-Sabah whose trip to Tehran has been widely seen as an attempt to warm up the frosty ties between Iran and Sunni-ruled monarchies in the Gulf."
Offering 118 new styles presented exclusively for Milan, he noted that high joints remained on trend, along with archly thin, stainless steel frames.