Business Statistics Made Easy in SAS by SAS Institute Inc

Author:SAS Institute Inc.
Language: eng
Format: epub
Publisher: SAS Institute Inc.
Published: 2015-10-21T17:42:17+00:00

The test you are using is more powerful.

Typically, each of the first four elements above is related to each other by an equation, the form of the equation depending on which test is used. This text won’t teach the equations, but they are quite easy to access.

Power Measured Before and After Testing

You can assess power before or after your study.

Assessing Power Before a Study: “A Priori” Power Analysis

It is possible to analyze aspects of power before even starting your research – we call this a priori power analysis. Why would you want to do such a thing? Usually, researchers want to know in advance of starting one of two things: a) how big a sample they need to gather in order to achieve their aim, or b) whether the sample they know they are going to get will allow for sufficient power.

To assess how big a sample you will need for a minimum level of power, you need the likely values of the major elements of power as follows:

The minimum power level you are willing to settle for: As discussed, researchers often use minimum power of .80.

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