{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:JHGVR65HBTTMP6NYM56GFJS7DE","short_pith_number":"pith:JHGVR65H","canonical_record":{"source":{"id":"1407.3912","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2014-07-15T08:46:27Z","cross_cats_sorted":[],"title_canon_sha256":"c5b43b080d0aa2fe0e6b36d7eb4a7d3dd224c63b2ab2c0f3a9fd77421d1f0fc3","abstract_canon_sha256":"2acdb38ef6ada5c86c21848cadbb0ac54c0e1a8efb7398c2c83817d9b10f6245"},"schema_version":"1.0"},"canonical_sha256":"49cd58fba70ce6c7f9b8677c62a65f191f61c7d49e9eea54e4bc3b6269115900","source":{"kind":"arxiv","id":"1407.3912","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.3912","created_at":"2026-05-18T02:47:32Z"},{"alias_kind":"arxiv_version","alias_value":"1407.3912v1","created_at":"2026-05-18T02:47:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.3912","created_at":"2026-05-18T02:47:32Z"},{"alias_kind":"pith_short_12","alias_value":"JHGVR65HBTTM","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_16","alias_value":"JHGVR65HBTTMP6NY","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_8","alias_value":"JHGVR65H","created_at":"2026-05-18T12:28:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:JHGVR65HBTTMP6NYM56GFJS7DE","target":"record","payload":{"canonical_record":{"source":{"id":"1407.3912","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2014-07-15T08:46:27Z","cross_cats_sorted":[],"title_canon_sha256":"c5b43b080d0aa2fe0e6b36d7eb4a7d3dd224c63b2ab2c0f3a9fd77421d1f0fc3","abstract_canon_sha256":"2acdb38ef6ada5c86c21848cadbb0ac54c0e1a8efb7398c2c83817d9b10f6245"},"schema_version":"1.0"},"canonical_sha256":"49cd58fba70ce6c7f9b8677c62a65f191f61c7d49e9eea54e4bc3b6269115900","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:47:32.316052Z","signature_b64":"UMAf16xn8epsbpIqNmHby+wc7jViiGGC4q2aRZgmDf2rSxBVJdj8bvsxAezGUotLh21xx4+B6s8CG+SN/vUBCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"49cd58fba70ce6c7f9b8677c62a65f191f61c7d49e9eea54e4bc3b6269115900","last_reissued_at":"2026-05-18T02:47:32.315442Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:47:32.315442Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.3912","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":"2026-05-18T02:47:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gIbWYr/E9irCwGg0j/eDMg1lATIO5tgRhpqjeAGr1upGSKRS9qBbf3Q+eUYEvYNUKCA2gMODXEIc8jHFOyB8Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T18:47:04.194614Z"},"content_sha256":"062f1b004fa56f9a507c0abbc541d92ae930e49c94c9dee2c01e67d7e7e9ca7d","schema_version":"1.0","event_id":"sha256:062f1b004fa56f9a507c0abbc541d92ae930e49c94c9dee2c01e67d7e7e9ca7d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:JHGVR65HBTTMP6NYM56GFJS7DE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Item selection by Latent Class-based methods","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"stat.AP","authors_text":"Francesco Bartolucci, Giorgio E. Montanari, Silvia Pandolfi","submitted_at":"2014-07-15T08:46:27Z","abstract_excerpt":"The evaluation of nursing homes is usually based on the administration of questionnaires made of a large number of polytomous items. In such a context, the Latent Class (LC) model represents a useful tool for clustering subjects in homogenous groups corresponding to different degrees of impairment of the health conditions. It is known that the performance of model-based clustering and the accuracy of the choice of the number of latent classes may be affected by the presence of irrelevant or noise variables. In this paper, we show the application of an item selection algorithm to real data coll"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.3912","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":"2026-05-18T02:47:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mRYINMJzPyNior8bA2u8aIMmSiSxjxRk5mUApw2V2A8OavI2pDb9W+ZU3+JAhbJAznBxFmIvTYE7dbpFEK6SCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T18:47:04.194985Z"},"content_sha256":"dffc0e1da4eb6a1b41f5fd011a4f326843a4dee0712df318a905125d6d4e0255","schema_version":"1.0","event_id":"sha256:dffc0e1da4eb6a1b41f5fd011a4f326843a4dee0712df318a905125d6d4e0255"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JHGVR65HBTTMP6NYM56GFJS7DE/bundle.json","state_url":"https://pith.science/pith/JHGVR65HBTTMP6NYM56GFJS7DE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JHGVR65HBTTMP6NYM56GFJS7DE/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":"2026-06-05T18:47:04Z","links":{"resolver":"https://pith.science/pith/JHGVR65HBTTMP6NYM56GFJS7DE","bundle":"https://pith.science/pith/JHGVR65HBTTMP6NYM56GFJS7DE/bundle.json","state":"https://pith.science/pith/JHGVR65HBTTMP6NYM56GFJS7DE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JHGVR65HBTTMP6NYM56GFJS7DE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:JHGVR65HBTTMP6NYM56GFJS7DE","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":"2acdb38ef6ada5c86c21848cadbb0ac54c0e1a8efb7398c2c83817d9b10f6245","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2014-07-15T08:46:27Z","title_canon_sha256":"c5b43b080d0aa2fe0e6b36d7eb4a7d3dd224c63b2ab2c0f3a9fd77421d1f0fc3"},"schema_version":"1.0","source":{"id":"1407.3912","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.3912","created_at":"2026-05-18T02:47:32Z"},{"alias_kind":"arxiv_version","alias_value":"1407.3912v1","created_at":"2026-05-18T02:47:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.3912","created_at":"2026-05-18T02:47:32Z"},{"alias_kind":"pith_short_12","alias_value":"JHGVR65HBTTM","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_16","alias_value":"JHGVR65HBTTMP6NY","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_8","alias_value":"JHGVR65H","created_at":"2026-05-18T12:28:33Z"}],"graph_snapshots":[{"event_id":"sha256:dffc0e1da4eb6a1b41f5fd011a4f326843a4dee0712df318a905125d6d4e0255","target":"graph","created_at":"2026-05-18T02:47:32Z","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":"The evaluation of nursing homes is usually based on the administration of questionnaires made of a large number of polytomous items. In such a context, the Latent Class (LC) model represents a useful tool for clustering subjects in homogenous groups corresponding to different degrees of impairment of the health conditions. It is known that the performance of model-based clustering and the accuracy of the choice of the number of latent classes may be affected by the presence of irrelevant or noise variables. In this paper, we show the application of an item selection algorithm to real data coll","authors_text":"Francesco Bartolucci, Giorgio E. Montanari, Silvia Pandolfi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2014-07-15T08:46:27Z","title":"Item selection by Latent Class-based methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.3912","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":"sha256:062f1b004fa56f9a507c0abbc541d92ae930e49c94c9dee2c01e67d7e7e9ca7d","target":"record","created_at":"2026-05-18T02:47:32Z","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":"2acdb38ef6ada5c86c21848cadbb0ac54c0e1a8efb7398c2c83817d9b10f6245","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.AP","submitted_at":"2014-07-15T08:46:27Z","title_canon_sha256":"c5b43b080d0aa2fe0e6b36d7eb4a7d3dd224c63b2ab2c0f3a9fd77421d1f0fc3"},"schema_version":"1.0","source":{"id":"1407.3912","kind":"arxiv","version":1}},"canonical_sha256":"49cd58fba70ce6c7f9b8677c62a65f191f61c7d49e9eea54e4bc3b6269115900","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"49cd58fba70ce6c7f9b8677c62a65f191f61c7d49e9eea54e4bc3b6269115900","first_computed_at":"2026-05-18T02:47:32.315442Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:47:32.315442Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UMAf16xn8epsbpIqNmHby+wc7jViiGGC4q2aRZgmDf2rSxBVJdj8bvsxAezGUotLh21xx4+B6s8CG+SN/vUBCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:47:32.316052Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.3912","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:062f1b004fa56f9a507c0abbc541d92ae930e49c94c9dee2c01e67d7e7e9ca7d","sha256:dffc0e1da4eb6a1b41f5fd011a4f326843a4dee0712df318a905125d6d4e0255"],"state_sha256":"493394b6beeae314224963e488c66be02b0dd542842635460824f398900a4174"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p85sMR0Qitw8QNYdUSv9KNJHKKM78n6lXgZioYUfq/RgJOVi2E5tspUwYPpPPrwMddxezvSNu3wZ5D1NOyhECg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T18:47:04.197519Z","bundle_sha256":"9dc749511dac003a46a4342b2dfaa145d2b35b708beb64a7bb3438ec2e8efefd"}}