Comparative evaluation of the reliability and validity of three data extraction programs: UnGraph, GraphClick, and DigitizeIt
Reliability and validity of three data extraction programs were investigated. Three coders extracted data from 60 graphs of SSER using the three programs. Results showed high degrees of reliability and validity of the programs. The three programs can be used to extract data from SSER study graphs. Extracted data can be used in meta-analyses of SSER with high level of confidence.
reliability and validity data extraction programs ungraph graphclick digitizeit single-subject experimental research designs