{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:GFEQ6ZCILHA6EIZBHKJPUDRYBN","short_pith_number":"pith:GFEQ6ZCI","canonical_record":{"source":{"id":"1210.5267","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2012-10-18T21:40:33Z","cross_cats_sorted":["stat.CO"],"title_canon_sha256":"dce332c61b42e7054bd83f0db404b32a4fa47e64163e2f702b7c726924d81b33","abstract_canon_sha256":"01ceddff4e65cb9c217137bdcf475c0e1e895e1fdb6b6e7fe126247871066eb9"},"schema_version":"1.0"},"canonical_sha256":"31490f644859c1e223213a92fa0e380b4403dcd23fc03c68406a3534ad7b157f","source":{"kind":"arxiv","id":"1210.5267","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.5267","created_at":"2026-05-18T03:42:45Z"},{"alias_kind":"arxiv_version","alias_value":"1210.5267v1","created_at":"2026-05-18T03:42:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.5267","created_at":"2026-05-18T03:42:45Z"},{"alias_kind":"pith_short_12","alias_value":"GFEQ6ZCILHA6","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GFEQ6ZCILHA6EIZB","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GFEQ6ZCI","created_at":"2026-05-18T12:27:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:GFEQ6ZCILHA6EIZBHKJPUDRYBN","target":"record","payload":{"canonical_record":{"source":{"id":"1210.5267","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2012-10-18T21:40:33Z","cross_cats_sorted":["stat.CO"],"title_canon_sha256":"dce332c61b42e7054bd83f0db404b32a4fa47e64163e2f702b7c726924d81b33","abstract_canon_sha256":"01ceddff4e65cb9c217137bdcf475c0e1e895e1fdb6b6e7fe126247871066eb9"},"schema_version":"1.0"},"canonical_sha256":"31490f644859c1e223213a92fa0e380b4403dcd23fc03c68406a3534ad7b157f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:42:45.676624Z","signature_b64":"FdRDJJT1HPD8kYObZcg3DzaHSoXebwUnsviwdSnNkHipuk/DELo5Rq7ZwDgoDoRylFy6BnMS8heTsr3jLM90Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"31490f644859c1e223213a92fa0e380b4403dcd23fc03c68406a3534ad7b157f","last_reissued_at":"2026-05-18T03:42:45.676160Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:42:45.676160Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1210.5267","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:42:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q/r9HWW2RcR7Xlyk6w222pTPyyrLd19WSYkVKIKTMMdN71YkwYTGqWl6MPL2HUxlZCQN6u2IQ1AlUAivUuRjDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T08:24:30.447963Z"},"content_sha256":"e0e67db6882b702ac4ef3e6500fb523df59f5f159e9c6553103d0b3eb18a12ff","schema_version":"1.0","event_id":"sha256:e0e67db6882b702ac4ef3e6500fb523df59f5f159e9c6553103d0b3eb18a12ff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:GFEQ6ZCILHA6EIZBHKJPUDRYBN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"MultiLCIRT: An R package for multidimensional latent class item response models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["stat.CO"],"primary_cat":"stat.AP","authors_text":"Francesco Bartolucci, Michela Gnaldi, Silvia Bacci","submitted_at":"2012-10-18T21:40:33Z","abstract_excerpt":"We illustrate a class of Item Response Theory (IRT) models for binary and ordinal polythomous items and we describe an R package for dealing with these models, which is named MultiLCIRT. The models at issue extend traditional IRT models allowing for (i) multidimensionality and (ii) discreteness of latent traits. This class of models also allows for different parameterizations for the conditional distribution of the response variables given the latent traits, depending on both the type of link function and the constraints imposed on the discriminating and the difficulty item parameters. We illu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.5267","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:42:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MR1zqC2xNBk40HNjPueA9YZeVRn+Q+lxOnCn24eqfQ68Q6biRf4fUBirZoHhhzjlkF75+3fIAofiral2oll6CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T08:24:30.448741Z"},"content_sha256":"f794462656bd914eb26c446d155b38c73314f3d533856893c0cfc9fde39f446a","schema_version":"1.0","event_id":"sha256:f794462656bd914eb26c446d155b38c73314f3d533856893c0cfc9fde39f446a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GFEQ6ZCILHA6EIZBHKJPUDRYBN/bundle.json","state_url":"https://pith.science/pith/GFEQ6ZCILHA6EIZBHKJPUDRYBN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GFEQ6ZCILHA6EIZBHKJPUDRYBN/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-06T08:24:30Z","links":{"resolver":"https://pith.science/pith/GFEQ6ZCILHA6EIZBHKJPUDRYBN","bundle":"https://pith.science/pith/GFEQ6ZCILHA6EIZBHKJPUDRYBN/bundle.json","state":"https://pith.science/pith/GFEQ6ZCILHA6EIZBHKJPUDRYBN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GFEQ6ZCILHA6EIZBHKJPUDRYBN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:GFEQ6ZCILHA6EIZBHKJPUDRYBN","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":"01ceddff4e65cb9c217137bdcf475c0e1e895e1fdb6b6e7fe126247871066eb9","cross_cats_sorted":["stat.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2012-10-18T21:40:33Z","title_canon_sha256":"dce332c61b42e7054bd83f0db404b32a4fa47e64163e2f702b7c726924d81b33"},"schema_version":"1.0","source":{"id":"1210.5267","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.5267","created_at":"2026-05-18T03:42:45Z"},{"alias_kind":"arxiv_version","alias_value":"1210.5267v1","created_at":"2026-05-18T03:42:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.5267","created_at":"2026-05-18T03:42:45Z"},{"alias_kind":"pith_short_12","alias_value":"GFEQ6ZCILHA6","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GFEQ6ZCILHA6EIZB","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GFEQ6ZCI","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:f794462656bd914eb26c446d155b38c73314f3d533856893c0cfc9fde39f446a","target":"graph","created_at":"2026-05-18T03:42:45Z","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":"We illustrate a class of Item Response Theory (IRT) models for binary and ordinal polythomous items and we describe an R package for dealing with these models, which is named MultiLCIRT. The models at issue extend traditional IRT models allowing for (i) multidimensionality and (ii) discreteness of latent traits. This class of models also allows for different parameterizations for the conditional distribution of the response variables given the latent traits, depending on both the type of link function and the constraints imposed on the discriminating and the difficulty item parameters. We illu","authors_text":"Francesco Bartolucci, Michela Gnaldi, Silvia Bacci","cross_cats":["stat.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2012-10-18T21:40:33Z","title":"MultiLCIRT: An R package for multidimensional latent class item response models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.5267","kind":"arxiv","version":1},"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:e0e67db6882b702ac4ef3e6500fb523df59f5f159e9c6553103d0b3eb18a12ff","target":"record","created_at":"2026-05-18T03:42:45Z","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":"01ceddff4e65cb9c217137bdcf475c0e1e895e1fdb6b6e7fe126247871066eb9","cross_cats_sorted":["stat.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2012-10-18T21:40:33Z","title_canon_sha256":"dce332c61b42e7054bd83f0db404b32a4fa47e64163e2f702b7c726924d81b33"},"schema_version":"1.0","source":{"id":"1210.5267","kind":"arxiv","version":1}},"canonical_sha256":"31490f644859c1e223213a92fa0e380b4403dcd23fc03c68406a3534ad7b157f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"31490f644859c1e223213a92fa0e380b4403dcd23fc03c68406a3534ad7b157f","first_computed_at":"2026-05-18T03:42:45.676160Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:42:45.676160Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FdRDJJT1HPD8kYObZcg3DzaHSoXebwUnsviwdSnNkHipuk/DELo5Rq7ZwDgoDoRylFy6BnMS8heTsr3jLM90Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:42:45.676624Z","signed_message":"canonical_sha256_bytes"},"source_id":"1210.5267","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e0e67db6882b702ac4ef3e6500fb523df59f5f159e9c6553103d0b3eb18a12ff","sha256:f794462656bd914eb26c446d155b38c73314f3d533856893c0cfc9fde39f446a"],"state_sha256":"579be489cac4df77ac48dfc46a740d5105769e1ae4fdeb662524c62a15a5718c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C5IYXlEvuFLNo9n1Ngc5NgVOgbNzYaoKxsXUSuVONw07rN6g6XPKBaQ/amEFDnz0gx05GNVB6/DyIUm5rRIqDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T08:24:30.452724Z","bundle_sha256":"284c396d8c3fd92ec50b8f3353442bcaf2fd411686121ebfcc8e5ad719e967c8"}}