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Data Transformation for autocorrelated baselines in Single System Designs

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# Data Transformation for autocorrelated baselines in Single System Designs - PowerPoint PPT Presentation

Data Transformation for autocorrelated baselines in Single System Designs. Examples First Difference Transformation (FDT) Moving Averages Transformation (MAT). The FDT Method. Subtract the 1 st point from the 2 nd Subtract the 2 nd point from the 3 rd Subtract the 3rd point from the 4 th

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## Data Transformation for autocorrelated baselines in Single System Designs

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### Data Transformation for autocorrelated baselines in Single System Designs

Examples

First Difference Transformation (FDT)

Moving Averages Transformation (MAT)

The FDT Method
• Subtract the 1st point from the 2nd
• Subtract the 2nd point from the 3rd
• Subtract the 3rd point from the 4th
• Continue this pattern until all points are subtracted
• Select a constant that will make all the data point greater than zero (s > 0).
• Add each constant to each data point
• Test for autocorrelation
• If NOT autocorrelated use the FDT method on the treatment data set
• Plot the new data set on a graph and use a statistic.
The MAT Method
• Add point 1 and point 2
• Divide the sum by 2
• Add point 2 and point 3
• Divide the sum by 2
• Add point 3 and point 4
• Continue this pattern until all points are added and divided
• Test for autocorrelation
• If NOT autocorrelated use the MAT method on the treatment data set
• Plot the new data set on a graph and use a statistic.