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Posted October 19, 2007
 | Helena Kraemer discusses reasons for taking a non-random sample. Quick Tip - 1 minute 58 seconds |
Posted October 19, 2007
| Husseini Manji advises investigators to address specific issues regarding comorbidity before beginning a study. Quick Tip - 1 minute 22 seconds |
Posted September 21, 2006
| Helena Kraemer shares her thoughts on what should and should not be called a pilot study. Quick Tip - 1 minute 54 seconds |
Posted July 28, 2006
 | Consulting with a Statistician Sue M. Marcus talks about how a statistician can help with your research design. Q&A |
Posted March 20, 2006
| Making Sense of Mediators and Moderators Helena Kraemer clarifies the roles of mediators, moderators, and interactions in RCTs. Q&A |