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TER SCHURE: Accumulation Bias – How to handle it ALL-IN

An estimated 85% of global health research investment is wasted (Chalmers and Glasziou, 2009); a total of one hundred billion US dollars in the year 2009 when it was estimated. The movement to reduce this research waste recommends that previous…

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To Your List of Biases in Meta-Analyses, Add This One: Accumulation Bias

[From the preprint “Accumulation bias in meta-analysis: the need to consider time in error control” by Judith ter Schure and Peter Grünwald, posted at arXiv.org] “Studies accumulate over time and meta-analyses are mainly retrospective. These two characteristics introduce dependencies between…

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