Pre/Post Data Analysis - Simple or Is It?This slide presentation reviews some of the problems of data analysis in analyzing pre and post data. Using as an example, ankle extensor strength (AES) experiments, to measure bone density loss during bed rest, the presentation discusses several questions: (1) How should we describe change? (2) Common analysis methods for comparing post to pre results. (3) What do we mean by "% change"? and (4) What are we testing when we compare % changes?
Document ID
20110008420
Acquisition Source
Johnson Space Center
Document Type
Presentation
Authors
Feiveson, Al (NASA Johnson Space Center Houston, TX, United States)
Fiedler, James (NASA Johnson Space Center Houston, TX, United States)
Ploutz-Snyder, Robert (NASA Johnson Space Center Houston, TX, United States)