Using UnGraph to extract data from image files: verification of reliability and validity.

@article{Shadish2009UsingUT,
  title={Using UnGraph to extract data from image files: verification of reliability and validity.},
  author={William R. Shadish and Isabel Cristiane F Brasil and David A. Illingworth and Kristen D White and Rodolfo Galindo and Eden D Nagler and David M Rindskopf},
  journal={Behavior research methods},
  year={2009},
  volume={41 1},
  pages={177-183}
}
Certain research tasks require extracting data points from graphs and charts. Using 91 graphs that presented results from single-case designs, we investigated whether pairs of coders extract similar data from the same graphs (reliability), and whether the extracted data match numerical descriptions of the graph that the original author may have presented in tables or text (validity). Coders extracted data using the UnGraph computer program. Extraction proved highly reliable over several… CONTINUE READING
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