Sample Size Calculation for a Hypothesis...

Michelle A. Detry, PhD, Berry Consultants LLC, discusses The Intention-to-Treat Principle: How to Assess the True Effect of Choosing a Medical Treatment with JAMA Statistical Editor Roger J. Lewis, MD, PhD. Related Content: The Intention-to-Treat Principle 

Roderick Little, PhD, University of Michigan School of Public Health Departments of Epidemiology & Biostatistics discusses Pattern-Mixture Models for Missing Data with Roger J. Lewis, MD, PhD, statistical editor for JAMA. Related Content: Pattern-Mixture Models for Missing Data 

Kert Viele, PhD, director and senior statistical scientist at Berry Consultants, discusses "Interpretation of Clinical Trials That Stopped Early" with JAMA Statistical Editor Roger J. Lewis, MD, PhD. Related Content: Interpretation of Clinical Trials That Stopped Early 

One of the most common causes for problems we see in manuscripts at JAMA is an inappropriately calculated study sample size. This seemingly mysterious process is explained by Lynne Stokes, PhD, professor of Statistical Science at Southern Methodist University in Dallas, Texas. 

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When does a crowd of people become unsafe? How well will the football team Aston Villa do next season? When is it cost-effective to replace a kitchen? The answers may seem arbitrary but, to Nira Chamberlain, they lie in mathematics. You can use maths to model virtually anything. 

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At a niche engineering conference, a young researcher shares some data that looks like an embarrassing mistake. Little does he know, his simple bar chart is the first pebble in an avalanche exposing a scandal of epic proportions. Producer: Ilan Goodman Sound Designer: Jon Nicholl ... Show More