4 concepts
What are Observational Studies?
An observational study is one in which no variables can be manipulated or controlled by the investigator.
The Clofibrate Trial
The Clofibrate Trial was a placebo-controlled study to determine the safety and effectiveness of drugs treating coronary heart disease in men.
Confounding
A confounding variable is an extraneous variable in a statistical model that correlates with both the dependent variable and the independent variable.
Sex Bias in Graduate Admissions
The Berkeley study is one of the best known real life examples of an experiment suffering from a confounding variable.