{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:USCEJKRGDQTYV2T74ICWCHNBLW","short_pith_number":"pith:USCEJKRG","canonical_record":{"source":{"id":"1708.03196","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2017-08-10T13:00:15Z","cross_cats_sorted":[],"title_canon_sha256":"7030199033eaba1d6254326d8daf0a447807bb0025b40b1db983bab5a2ed1167","abstract_canon_sha256":"ec2cbc5cf63a6398236169bf78f1e48a0ced1322eef1984cf7cff16910cc73b9"},"schema_version":"1.0"},"canonical_sha256":"a48444aa261c278aea7fe205611da15d8720a787b4d35900b1923da926101527","source":{"kind":"arxiv","id":"1708.03196","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.03196","created_at":"2026-05-18T00:38:14Z"},{"alias_kind":"arxiv_version","alias_value":"1708.03196v1","created_at":"2026-05-18T00:38:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.03196","created_at":"2026-05-18T00:38:14Z"},{"alias_kind":"pith_short_12","alias_value":"USCEJKRGDQTY","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"USCEJKRGDQTYV2T7","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"USCEJKRG","created_at":"2026-05-18T12:31:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:USCEJKRGDQTYV2T74ICWCHNBLW","target":"record","payload":{"canonical_record":{"source":{"id":"1708.03196","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2017-08-10T13:00:15Z","cross_cats_sorted":[],"title_canon_sha256":"7030199033eaba1d6254326d8daf0a447807bb0025b40b1db983bab5a2ed1167","abstract_canon_sha256":"ec2cbc5cf63a6398236169bf78f1e48a0ced1322eef1984cf7cff16910cc73b9"},"schema_version":"1.0"},"canonical_sha256":"a48444aa261c278aea7fe205611da15d8720a787b4d35900b1923da926101527","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:38:14.508136Z","signature_b64":"ruPIyF0tsgqBLpK+uVuzL/IfZZT4NrWZeI899VJeWWxVIW8fW3tDtONFUhIlRVbfPsb7emlvsnW0BUcz5C9jCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a48444aa261c278aea7fe205611da15d8720a787b4d35900b1923da926101527","last_reissued_at":"2026-05-18T00:38:14.507440Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:38:14.507440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.03196","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":"2026-05-18T00:38:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ywRpZzyUWGpwfPyupzRvDdtQgbSMdOotb8uWVRG3xIkktD+6eE3f9EwseYGyyv1ReXH98M8YBE4CfSA7KqxYCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T21:50:37.183124Z"},"content_sha256":"0e7a7a7330208f3f3bed100cd71d9fff4626c3d2adaaf82f3e7b7f25d2418b5b","schema_version":"1.0","event_id":"sha256:0e7a7a7330208f3f3bed100cd71d9fff4626c3d2adaaf82f3e7b7f25d2418b5b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:USCEJKRGDQTYV2T74ICWCHNBLW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Improving the Pe\\~na-Prieto \"KSD\" procedure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"stat.ME","authors_text":"Ricardo Maronna","submitted_at":"2017-08-10T13:00:15Z","abstract_excerpt":"Pe\\~{n}a and Prieto (2007) proposed the \"Kurtosis plus specific directions\" (KSD) method for robust multivariate location and scatter estimation and outlier detection. Maronna and Yohai (2017) employed it as an initial estimator for multivariate S- and MM-estimators, and their simulations showed that KSD generally outperforms initial estimators based on subsampling. However further simulations show that KSD may become unstable and give wrong results in extreme situations when the contamination rate is \"high\" (>=0.2) and the ratio n/p of cases to variables is \"low\" (<10). Two simple modificatio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.03196","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":"2026-05-18T00:38:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"giDC2U9YJ9xkUxLguWWTmTE1Xv8ITExMtr4AMCglyNqHswew3S8fhUV7b69C0u8kKT8G6QOVArW7r8L/Yxk8Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T21:50:37.183611Z"},"content_sha256":"157587362c3bc6fdbff48090a43fd6d6f8ee5655012a6c4110aeaa9209536e7d","schema_version":"1.0","event_id":"sha256:157587362c3bc6fdbff48090a43fd6d6f8ee5655012a6c4110aeaa9209536e7d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/USCEJKRGDQTYV2T74ICWCHNBLW/bundle.json","state_url":"https://pith.science/pith/USCEJKRGDQTYV2T74ICWCHNBLW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/USCEJKRGDQTYV2T74ICWCHNBLW/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":"2026-06-22T21:50:37Z","links":{"resolver":"https://pith.science/pith/USCEJKRGDQTYV2T74ICWCHNBLW","bundle":"https://pith.science/pith/USCEJKRGDQTYV2T74ICWCHNBLW/bundle.json","state":"https://pith.science/pith/USCEJKRGDQTYV2T74ICWCHNBLW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/USCEJKRGDQTYV2T74ICWCHNBLW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:USCEJKRGDQTYV2T74ICWCHNBLW","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":"ec2cbc5cf63a6398236169bf78f1e48a0ced1322eef1984cf7cff16910cc73b9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2017-08-10T13:00:15Z","title_canon_sha256":"7030199033eaba1d6254326d8daf0a447807bb0025b40b1db983bab5a2ed1167"},"schema_version":"1.0","source":{"id":"1708.03196","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.03196","created_at":"2026-05-18T00:38:14Z"},{"alias_kind":"arxiv_version","alias_value":"1708.03196v1","created_at":"2026-05-18T00:38:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.03196","created_at":"2026-05-18T00:38:14Z"},{"alias_kind":"pith_short_12","alias_value":"USCEJKRGDQTY","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_16","alias_value":"USCEJKRGDQTYV2T7","created_at":"2026-05-18T12:31:49Z"},{"alias_kind":"pith_short_8","alias_value":"USCEJKRG","created_at":"2026-05-18T12:31:49Z"}],"graph_snapshots":[{"event_id":"sha256:157587362c3bc6fdbff48090a43fd6d6f8ee5655012a6c4110aeaa9209536e7d","target":"graph","created_at":"2026-05-18T00:38:14Z","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":"Pe\\~{n}a and Prieto (2007) proposed the \"Kurtosis plus specific directions\" (KSD) method for robust multivariate location and scatter estimation and outlier detection. Maronna and Yohai (2017) employed it as an initial estimator for multivariate S- and MM-estimators, and their simulations showed that KSD generally outperforms initial estimators based on subsampling. However further simulations show that KSD may become unstable and give wrong results in extreme situations when the contamination rate is \"high\" (>=0.2) and the ratio n/p of cases to variables is \"low\" (<10). Two simple modificatio","authors_text":"Ricardo Maronna","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2017-08-10T13:00:15Z","title":"Improving the Pe\\~na-Prieto \"KSD\" procedure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.03196","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":"sha256:0e7a7a7330208f3f3bed100cd71d9fff4626c3d2adaaf82f3e7b7f25d2418b5b","target":"record","created_at":"2026-05-18T00:38:14Z","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":"ec2cbc5cf63a6398236169bf78f1e48a0ced1322eef1984cf7cff16910cc73b9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2017-08-10T13:00:15Z","title_canon_sha256":"7030199033eaba1d6254326d8daf0a447807bb0025b40b1db983bab5a2ed1167"},"schema_version":"1.0","source":{"id":"1708.03196","kind":"arxiv","version":1}},"canonical_sha256":"a48444aa261c278aea7fe205611da15d8720a787b4d35900b1923da926101527","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a48444aa261c278aea7fe205611da15d8720a787b4d35900b1923da926101527","first_computed_at":"2026-05-18T00:38:14.507440Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:38:14.507440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ruPIyF0tsgqBLpK+uVuzL/IfZZT4NrWZeI899VJeWWxVIW8fW3tDtONFUhIlRVbfPsb7emlvsnW0BUcz5C9jCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:38:14.508136Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.03196","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e7a7a7330208f3f3bed100cd71d9fff4626c3d2adaaf82f3e7b7f25d2418b5b","sha256:157587362c3bc6fdbff48090a43fd6d6f8ee5655012a6c4110aeaa9209536e7d"],"state_sha256":"d86b704eadb3f0aa464afa605df4381073b7c2a1654797ad83346b49ae532f29"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4AI5RmyqlfAs9/yeqDqpKIAP98KIWugtG8yLb81BU/JD1RhihLjGPNLBIXGBmMyG7BX39XzpBPTqJfwAFILuAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-22T21:50:37.186206Z","bundle_sha256":"f16a5c3d96a9de4d960b3e428eb1aa3cda0061533913a5ecae0839222562b438"}}