Evidence Relationship: Opposes
Vote on whether "Reanalysis of the Ferreiro & Adeyemi cells using a hierarchical ordinal model finds subadditivity of stacked framing manipulations (ratio 0.62)" is good evidence that opposes the claim "The 19-point minimum asymmetry gap exceeds the largest single framing effect (18 points) recorded across the same protocol"
Evidence Claim
Reanalysis of the Ferreiro & Adeyemi cells using a hierarchical ordinal model finds subadditivity of stacked framing manipulations (ratio 0.62)
An independent reanalysis by Ntumba (2024) fit a cumulative-link mixed model to the raw item-level data, estimating that combined manipulations produce 62% of the sum of their individual effects (95% CI [0.51, 0.74]). The subadditivity is strongest among manipulations sharing a hypothesized affective pathway, consistent with a shared saturating mechanism rather than independent additive biases.
Main Claim
The 19-point minimum asymmetry gap exceeds the largest single framing effect (18 points) recorded across the same protocol
Within the Ferreiro & Adeyemi dataset, the maximal framing-induced shift in Footbridge endorsement was 18 points (the intrinsic-versus-carried mass manipulation). Because the smallest asymmetry gap across all 27 cells was 19 points, no single documented artifact is large enough to generate the asymmetry from nothing, even under the most favorable arithmetic to the debunker.
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Appreciate that the appendix reports the alternative specification instead of hiding it. Both estimates are well below 1, so the qualitative conclusion is robust to the link choice.