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Validity and Reliability Analysis of the PlotDigitizer Software Program for Data Extraction from Single-Case Graphs
Perspectives on Behavior Science ( IF 3.226 ) Pub Date : 2021-03-31 , DOI: 10.1007/s40614-021-00284-0
Orhan Aydin 1 , Muhammed Yasin Yassikaya 2
Affiliation  

Access to raw data of graphs presented in original articles to calculate the effect size of single-case research is a challenge for researchers conducting studies such as meta-analysis. Researchers typically use data extraction software programs to extract raw data from the graphs in articles. In this study, we aimed to analyze the validity and reliability of the PlotDigitizer software program, which is widely used in literature and an alternative to other data extraction programs, on computers with different operating systems. We performed the digitization of 6.846 data points on three different computers using 15 hypothetical graphs with 20 data series and 186 graphs with 242 data series from 29 published articles to accomplish the goal. Besides, using the values we digitized, we recalculated the 23 effect sizes presented in the original articles for validity analysis. Based on our sampling, we calculated intercoder and intracoder Pearson correlation coefficients. The results showed that PlotDigitizer could be an alternative to other programs as it is free and can run on many current and outdated systems, and it is valid and reliable as it is nearly perfect. Based on the obtained results and considering the data extraction process, we presented various recommendations for the researchers that will use the PlotDigitizer program for the quantitative analysis of single-case graphs.



中文翻译:

PlotDigitizer 单例图数据提取软件程序的有效性和可靠性分析

访问原始文章中提供的图表的原始数据以计算单一案例研究的影响大小对于进行元分析等研究的研究人员来说是一个挑战。研究人员通常使用数据提取软件程序从文章中的图表中提取原始数据。在本研究中,我们旨在分析 PlotDigitizer 软件程序在具有不同操作系统的计算机上的有效性和可靠性,该软件程序在文献中广泛使用,是其他数据提取程序的替代方案。我们使用来自 29 篇已发表文章的 15 个带有 20 个数据系列的假设图表和带有 242 个数据系列的 186 个图表在三台不同的计算机上对 6.846 个数据点进行了数字化,以实现目标。此外,使用我们数字化的值,我们重新计算了原始文章中提出的 23 个效应量以进行有效性分析。基于我们的采样,我们计算了编码器间和编码器内皮尔逊相关系数。结果表明,PlotDigitizer 可以替代其他程序,因为它是免费的并且可以在许多当前和过时的系统上运行,并且它是有效和可靠的,因为它几乎是完美的。基于获得的结果并考虑到数据提取过程,我们为将使用 PlotDigitizer 程序对单例图进行定量分析的研究人员提出了各种建议。结果表明,PlotDigitizer 可以替代其他程序,因为它是免费的并且可以在许多当前和过时的系统上运行,并且它是有效和可靠的,因为它几乎是完美的。基于获得的结果并考虑到数据提取过程,我们为将使用 PlotDigitizer 程序对单例图进行定量分析的研究人员提出了各种建议。结果表明,PlotDigitizer 可以替代其他程序,因为它是免费的并且可以在许多当前和过时的系统上运行,并且它是有效和可靠的,因为它几乎是完美的。基于获得的结果并考虑到数据提取过程,我们为将使用 PlotDigitizer 程序对单例图进行定量分析的研究人员提出了各种建议。

更新日期:2021-04-01
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