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Expert Analysis

Price Impact Analysis — Where The Halliburton Court Erred

Law360, New York (August 25, 2015, 5:30 PM EDT) -- The Northern District of Texas' July 25, 2015, decision in Halliburton has already been touted as a "bellwether" opinion on how to prove the absence of price impact to defeat class certification.[1] Unfortunately, the opinion is based partly on a common fallacy — that the absence of statistical significance proves the absence of price impact.[2] For single-firm event studies used in securities litigation, the absence of statistical significance is typically "more fairly described as inconclusive."[3]...

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