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Within-subjects statistics for one observation

Analyze one baseline observation of a categorical, ordinal, or continuous outcome

Within-subjects statistics for one observation tend to be a baseline observations to which future observations of an outcome are compared. When trying to establish treatment effects, a baseline measure should be taken to establish where participants "are" before an intervention to better understand how much change or stability has occurred as a result of treatment or time. The correct statistical test is chosen based on the scale of measurement of the outcome. 

What is the scale of measurement for the outcome in the within-subjects analysis?

The outcome represents numerical designations or categorical values that describe exposures, characteristics, phenomena, events, or group membership.
Categorical
The outcome variable is measured using an ordered numerical continuum, such as a Likert scale.
Ordinal
The outcome variable is an actual number that provides both a measure of distance and magnitude due to having a "true zero."    
Continuous

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Within-subjects statistics for one observation: Baseline frequency, baseline median, and baseline observation.

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