{"id":1985,"slug":"parry-2021-nature-meta-self-report-divergence","title":"Parry et al. 2021 — pre-registered meta-analysis: self-report ≠ logged media use","kind":"reference","scope":"business","status":"current","audiences":["kevin","candid-team"],"topics":["self-report-validity"],"reference_body":"**Claim:** Parry et al. (2021, *Nature Human Behaviour*), a **pre-registered meta-analysis of 106 effect sizes**, found self-reported digital media use \"correlates only moderately with logged measurements\" and \"self-reports were rarely an accurate reflection of logged media use.\"\n\n**Source:** Parry, Davidson, Sewall, Fisher, Mieczkowski, Quintana 2021, *Nature Human Behaviour*. Pre-registered, peer-reviewed.\n\n**Confidence:** Verified.\n\n**Why this matters for Candid:** The largest, most rigorous synthesis on the question agrees with [[junco-2013-facebook-self-report-overestimate]] — and it is pre-registered, removing the selective-reporting concern. The mechanism (memory + social desirability) generalises beyond Facebook; expect any \"how often do you update your site / post / send emails\" answer to overstate reality.","rationale_body":null,"metadata":null,"links":{"outgoing":[],"incoming":[{"slug":"research-brief-smb-widget-capture-layer-june-2026","title":"Research brief: SMB widget capture layer — what owners can vs cannot self-report (June 2026)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"rule-r5-output-tiers-not-scores","title":"R5 — Output tiers, not precise scores","kind":"rule","scope":"business","link_type":"depends-on"}]},"created_at":"2026-06-23T19:16:00.835Z","updated_at":"2026-06-23T19:16:00.835Z"}