Making Sense of Mediators and Moderators

Helena Kraemer clarifies the roles of mediators, moderators, and interactions in RCTs.

Q&A

Defining a Pilot Study

Helena Kraemer shares her thoughts on what should and should not be called a pilot study.

Quick Tip - 1 minute 54 seconds

Questions About Comorbidity

Husseini Manji advises investigators to address specific issues regarding comorbidity before beginning a study.

Quick Tip - 1 minute 22 seconds

Blocking and Matching

Helena Kraemer discusses reasons for taking a non-random sample.

Quick Tip - 1 minute 58 seconds

Consulting with a Statistician

Sue M. Marcus talks about how a statistician can help with your research design.

Q&A