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Any binary division of the sample period will show one group performing better than the other.
FORBES: Maybe Tall Democratic Presidents Are Better For Stocks
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The association becomes insignificant, according to the research, beginning in 2008 and continues through the end of the sample period in 2010.
FORBES: Audit Firm Rotation: Maybe Make A Switch When The Government Takes Over
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In forecasts extending beyond the sample period used in the study, a stern test of any model, Mr Oswald's approach easily outperforms its rivals, including consensus predictions of commercial forecasters.
ECONOMIST: Oil and the new economy
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Although the AP poll shows Huckabee at 10 percent, the poll's sample period began nearly a month ago, before Huckabee's recent heightened media attention.
CNN: GOP race still wide open in South Carolina
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Payouts would only materialise if the advertising firm stayed among the top two companies against a sample of 14 rivals during a period of five to nine years, he argued.
BBC: Sir Martin Sorrell, chief executive, WPP
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Other plans for the money include running sample 1940s school lessons, where children can dress in period costume and take part in gas mark drills.
BBC: NEWS | UK | Grants give pupils taste of WWII
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"The formula effect generally, and particularly in the case of clothing, is dependent not just on the choice of index but also on the characteristics of the price movements and levels being measured, sample design, choice of base period and price collection methods, " said its spokeswoman Jill Leyland.
BBC: Inflation: No change to RPI calculation
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The report said in a sample of 31 authorised credit card transaction logs covering a three month period, 25 (80%) included expenditure which was either not in accordance with the council's guidelines or supported by invoices or receipts.
BBC: Lord Hanningfield