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Using visual analysis to measure the effects of intervention

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Page 219

1.- Visual analysis is used to communicate the impact of an intervention in visual form. What are the three primary ways that the pattern of scores established during a baseline or intervention stage may be viewed? When is each of them best used? What information is conveyed and what information may be omitted by choosing each one of them over the others?

This is the text book:

The practice of Research in Social Work. Author: Rafael J. Engel and Russell K. Schutt
Single-Subject Design
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Using visual analysis to measure the effects of intervention and three primary ways that the pattern of scores established during a baseline or intervention stage may be viewed.

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I suggest you read these Web sites:
http://www.cec.sped.org/Content/NavigationMenu/ProfessionalDevelopment/ProfessionalStandards/Current%20SSD%20revised%2004-07-04.pdf
http://self.uws.edu.au/Theses/Dixon/CHAPTER_6.pdf

You will find in the second one (page 159) two of the patterns that can be identified:

1. Level is the change from the last measurement in each phase to the first measurement in the next phase.
2. Trend looks at the direction of points within a phase.

A third one that seems important would be variability. This measures the degree to which performance fluctuations around a mean or slope during a phase.

I can see how each of these patterns could be useful for the therapist.

Level: The level of a behavior is the increase or decrease in a behavior from ...

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