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Category: Project

Description: Forbes, Wright, Markon, and Krueger (2017) state that “psychopathology networks have limited replicability” and that “popular network analysis methods produce unreliable results”. These conclusions are based on an assessment of the replicability of four different network models for symptoms of major depression and generalized anxiety across two samples; in addition, Forbes et al. (2017) analyze the stability of the network models within the samples using split-halves. Our re-analysis of the same data with the same methods led to results directly opposed to those of Forbes et al. (2017): All network models replicate very well across the two datasets and across the split-halves. We trace the differences between Forbes et al.’s (2017) results and our own to the fact that they did not appear to accurately implement all network models, and used debatable metrics to assess replicability. In particular, Forbes et al. (2017) deviate from existing estimation routines for relative importance networks, do not acknowledge the fact that the skip-structure used in the interviews strongly distorted correlations between symptoms, and incorrectly assume that network structures and metrics should not only be expected to be the same across the different samples, but also across the different network models used. In addition to a comprehensive re-analysis of the data, we end with a discussion of best practices concerning future research into the replicability of psychometric networks.