What’s the difference between parametric, component, and comparative analyses? And what do experimental designs have to do with it? PTB founder Dana Meller clears up the confusion with a deep dive into analysis variations.

A type of experiment in which the effects of the independent variable are presented and withdrawn, comparing the effects of both conditions on the dependent variable

A type of experiment in which the effects of differential amounts of the independent variable are presented and compared to the dependent variable.

When the effects of one component of a treatment package may be influenced or modified by the presence or interaction of another component.

A method for conducting a component analysis that includes presenting the entire treatment package and then systematically removing individual components to identify which components are necessary for meeting treatment goals.

An applied comparison of two or more treatments to assess which treatment is most effective.

A method for conducting a component analysis that identifies the effective components of a treatment package by comparing each component individually or in different combinations, to the complete treatment package.

When an individual component of a treatment package acts alone to produce a desired effect and does not impact the effectiveness or lack thereof of the other components.