Validity and Reliability Analysis of the PlotDigitizer Software Program for Data Extraction from Single-Case Graphs
Orhan Aydin1, Muhammed Yasin Yassikaya2
1Research Institute for Individuals with Disabilities, Anadolu University, 6470 Eskişehir, Turkey.
Perspectives on Behavior Science
|March 28, 2022
Summary
PlotDigitizer software is a valid and reliable tool for extracting graph data in single-case research. This free program offers an accessible alternative for researchers conducting meta-analyses and quantitative graph analysis.
Area of Science:
- Behavioral Science
- Psychology
- Research Methodology
Background:
- Accessing raw data from graphs in single-case research is crucial for effect size calculation in meta-analyses.
- Data extraction software is commonly used, but alternatives are needed.
Purpose of the Study:
- To analyze the validity and reliability of the PlotDigitizer software for extracting data from graphs.
- To assess PlotDigitizer's performance across different operating systems.
Main Methods:
- Digitized 6,846 data points from 15 hypothetical and 186 published graphs across 29 articles.
- Recalculated 23 effect sizes for validity analysis.
- Calculated intercoder and intracoder Pearson correlation coefficients.
Main Results:
- PlotDigitizer demonstrated high validity and reliability, performing nearly perfectly.
- The software is free, compatible with various operating systems (current and outdated), making it a viable alternative.
Conclusions:
- PlotDigitizer is a valid, reliable, and accessible tool for quantitative analysis of single-case graphs.
- Recommendations are provided for researchers utilizing PlotDigitizer for data extraction.
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