Newell Rubbermaid, Inc. v. Raymond Corp., 676 F.3d 521 (6th Cir. 2012):
Red flags that caution against certifying an expert include reliance on anecdotal evidence, improper extrapolation, failure to consider other possible causes, lack of testing, and subjectivity. Best v. Lowe's Home Ctrs., Inc., 563 F.3d 171, 177 (6th Cir. 2009). In addition, if a purported expert's opinion was prepared solely for litigation, that may also be considered as a basis for exclusion. Johnson v. Manitowoc Boom Trucks, Inc., 484 F.3d 426, 434 (6th Cir. 2007).
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