{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:ZMBP3FFPE7IUSY7PX3V3VBTH7W","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"979d0d42514b301bd9520c1730a0b5a1a89fac4fd6d1a5a7a3b2b765795a1253","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2017-08-13T23:19:28Z","title_canon_sha256":"fceab27ebc70546fe4f29e27770cb75bf62db247adf4aa52876047446329a2f4"},"schema_version":"1.0","source":{"id":"1708.03975","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.03975","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"arxiv_version","alias_value":"1708.03975v2","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.03975","created_at":"2026-05-18T00:27:45Z"},{"alias_kind":"pith_short_12","alias_value":"ZMBP3FFPE7IU","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZMBP3FFPE7IUSY7P","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZMBP3FFP","created_at":"2026-05-18T12:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:6d0859769d274eb88f2a3299ff768c1e73832dd668471879ba84a7b649bdf403","target":"graph","created_at":"2026-05-18T00:27:45Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Traditional Item Response Theory models assume the distribution of the abilities of the population in study to be Gaussian. However, this may not always be a reasonable assumption, which motivates the development of more general models. This paper presents a generalised approach for the distribution of the abilities in dichotomous 3-parameter Item Response models. A mixture of normal distributions is considered, allowing for features like skewness, multimodality and heavy tails. A solution is proposed to deal with model identifiability issues without compromising the flexibility and practical ","authors_text":"B\\'arbara C. C. Dias, Fl\\'avio B. Gon\\c{c}alves, Tufi M. Soares","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2017-08-13T23:19:28Z","title":"Bayesian Item Response model: a generalised approach for the abilities' distribution using mixtures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.03975","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:541a10b5446dd5376722a70b8f638c35edfb7f01aa546a0735e0eb36d84c45c2","target":"record","created_at":"2026-05-18T00:27:45Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"979d0d42514b301bd9520c1730a0b5a1a89fac4fd6d1a5a7a3b2b765795a1253","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2017-08-13T23:19:28Z","title_canon_sha256":"fceab27ebc70546fe4f29e27770cb75bf62db247adf4aa52876047446329a2f4"},"schema_version":"1.0","source":{"id":"1708.03975","kind":"arxiv","version":2}},"canonical_sha256":"cb02fd94af27d14963efbeebba8667fda047e848ce31288623381e874d393a33","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cb02fd94af27d14963efbeebba8667fda047e848ce31288623381e874d393a33","first_computed_at":"2026-05-18T00:27:45.984711Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:27:45.984711Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SXuK62x9YlfeoZEizOAC4Szsv1iwLmfhk6ThssabvMBt4G9AMXKHo6cnNl8u4uR9g8ySOrO7XC1G5Fcqkc8gDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:27:45.985159Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.03975","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:541a10b5446dd5376722a70b8f638c35edfb7f01aa546a0735e0eb36d84c45c2","sha256:6d0859769d274eb88f2a3299ff768c1e73832dd668471879ba84a7b649bdf403"],"state_sha256":"829222bc41f7278143b8797ebb14206e44fa9d387b38981fbdb52083249b0491"}