Statistics and Causation in Class Actions: Leveraging and Attacking Extrapolation for Aggregate Proof of Causation

A live 90-minute CLE webinar with interactive Q&A

Wednesday, September 25, 2019 (in 3 days)

1:00pm-2:30pm EDT, 10:00am-11:30am PDT

(Alert: Event date has changed from 6/6/2019!)

or call 1-800-926-7926

This CLE webinar will discuss how counsel can use statistics in proving individual causation issues in class action litigation, including innovative techniques designed to try class claims, recent case law, and practical considerations and strategies.


As the number of class actions has increased--outstripping the capacity of courts to decide several claims arising from the same alleged substantial contributing factor--courts are considering innovative extrapolation techniques on causation designed to try class claims while preserving defendants' rights.

Courts have repeatedly emphasized that the determinative issues on causation are individual and the possibility of class-wide determination of general causation does not relieve class members of the burden of presenting individualized proof of specific causation, and that the defendant's conduct caused their injury.

For instance, the prosecution and defense of a medical causation case should be based on individualized evidence about a person's diagnosis of disease and other risk factors. Similarly, proof of causation of economic injury should address individuals, not composites or examples.

Listen as our experienced panel of class action practitioners examines the use of statistics to prove causation in class litigation, the implications of recent case law, and practical considerations for class litigators seeking to use or restrict this evidence during class certification and trial.



  1. Overview
  2. Extrapolation techniques
  3. Role of statistical evidence in proving individual causation
  4. Recent case law
  5. Practical considerations and strategies


The panel will review these and other key issues:

  • What are the implications of recent case law on the use of statistical sampling to prove causation in class actions?
  • What types of causation statistics can counsel introduce during certification and trial and what are the proper ways to utilize them?
  • What are the most effective challenges to the use of statistical evidence?


Iannucci, Michael
Michael A. Iannucci

Blank Rome

Mr. Iannucci concentrates his practice in complex commercial and class action litigation matters, serving both...  |  Read More

Wilner, Benjamin
Dr. Benjamin Wilner, Ph.D.

Managing Director
Alvarez & Marsal

Dr. Wilner is an economist and statistician who regularly serves as a consultant and testifying expert witness on...  |  Read More

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