{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:QFS6GCPMTPXYAPATYMOKJOYYUT","short_pith_number":"pith:QFS6GCPM","canonical_record":{"source":{"id":"1904.02308","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2019-04-04T02:05:04Z","cross_cats_sorted":[],"title_canon_sha256":"e015ba5d77ff75a326c007e47a923958e4284a2e91d9071324342de3f547f7c6","abstract_canon_sha256":"8a232c8dd1cfd1988be96ad535a261fc7b6249d72e506520b5ea1a636ff743d7"},"schema_version":"1.0"},"canonical_sha256":"8165e309ec9bef803c13c31ca4bb18a4c16dd12bde9df46e8731e195c94d1547","source":{"kind":"arxiv","id":"1904.02308","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.02308","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"arxiv_version","alias_value":"1904.02308v3","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.02308","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"pith_short_12","alias_value":"QFS6GCPMTPXY","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"pith_short_16","alias_value":"QFS6GCPMTPXYAPAT","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"pith_short_8","alias_value":"QFS6GCPM","created_at":"2026-07-05T05:49:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:QFS6GCPMTPXYAPATYMOKJOYYUT","target":"record","payload":{"canonical_record":{"source":{"id":"1904.02308","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2019-04-04T02:05:04Z","cross_cats_sorted":[],"title_canon_sha256":"e015ba5d77ff75a326c007e47a923958e4284a2e91d9071324342de3f547f7c6","abstract_canon_sha256":"8a232c8dd1cfd1988be96ad535a261fc7b6249d72e506520b5ea1a636ff743d7"},"schema_version":"1.0"},"canonical_sha256":"8165e309ec9bef803c13c31ca4bb18a4c16dd12bde9df46e8731e195c94d1547","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:49:03.670626Z","signature_b64":"ZXkPVhC3hIdHjk56KYGWTfnqrloPMmKX62SEN/qQtgcMd4GwpL55RHzRiT1CGVsaDSke8rNvSOSKFSJ0uITZCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8165e309ec9bef803c13c31ca4bb18a4c16dd12bde9df46e8731e195c94d1547","last_reissued_at":"2026-07-05T05:49:03.670019Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:49:03.670019Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.02308","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:49:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fqcdhelVlmqDNPcHNG4q6IaH5tJNAiII5lqf6ftCmm3ZzEuFCsVq5HA02vrIg9fvGrFurCATWGkwy6S2EEtgDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T02:25:40.844829Z"},"content_sha256":"5cde75c2b5dbb5178dd98dd38faa7e9fbacf75f506888a1c347918de9c790550","schema_version":"1.0","event_id":"sha256:5cde75c2b5dbb5178dd98dd38faa7e9fbacf75f506888a1c347918de9c790550"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:QFS6GCPMTPXYAPATYMOKJOYYUT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Randomization tests for peer effects in group formation experiments","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"stat.ME","authors_text":"Avi Feller, Guillaume Basse, Panos Toulis, Peng Ding","submitted_at":"2019-04-04T02:05:04Z","abstract_excerpt":"Measuring the effect of peers on individuals' outcomes is a challenging problem, in part because individuals often select peers who are similar in both observable and unobservable ways. Group formation experiments avoid this problem by randomly assigning individuals to groups and observing their responses; for example, do first-year students have better grades when they are randomly assigned roommates who have stronger academic backgrounds? In this paper, we propose randomization-based permutation tests for group formation experiments, extending classical Fisher Randomization Tests to this set"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.02308","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1904.02308/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T05:49:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Hx7tRXVMlNxRFtyP9NsswBT/tKrAAB/R3k+nffpr609vu3vcMqrjQI5tTkIGNOPfh5qvOrHvtJanWZzgalb/Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T02:25:40.845253Z"},"content_sha256":"d3988bbcc7c9ef0083b7a5531e26a75682c09ec9d8820c730bb67a5e1efce907","schema_version":"1.0","event_id":"sha256:d3988bbcc7c9ef0083b7a5531e26a75682c09ec9d8820c730bb67a5e1efce907"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QFS6GCPMTPXYAPATYMOKJOYYUT/bundle.json","state_url":"https://pith.science/pith/QFS6GCPMTPXYAPATYMOKJOYYUT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QFS6GCPMTPXYAPATYMOKJOYYUT/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":"2026-07-09T02:25:40Z","links":{"resolver":"https://pith.science/pith/QFS6GCPMTPXYAPATYMOKJOYYUT","bundle":"https://pith.science/pith/QFS6GCPMTPXYAPATYMOKJOYYUT/bundle.json","state":"https://pith.science/pith/QFS6GCPMTPXYAPATYMOKJOYYUT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QFS6GCPMTPXYAPATYMOKJOYYUT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:QFS6GCPMTPXYAPATYMOKJOYYUT","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":"8a232c8dd1cfd1988be96ad535a261fc7b6249d72e506520b5ea1a636ff743d7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2019-04-04T02:05:04Z","title_canon_sha256":"e015ba5d77ff75a326c007e47a923958e4284a2e91d9071324342de3f547f7c6"},"schema_version":"1.0","source":{"id":"1904.02308","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.02308","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"arxiv_version","alias_value":"1904.02308v3","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.02308","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"pith_short_12","alias_value":"QFS6GCPMTPXY","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"pith_short_16","alias_value":"QFS6GCPMTPXYAPAT","created_at":"2026-07-05T05:49:03Z"},{"alias_kind":"pith_short_8","alias_value":"QFS6GCPM","created_at":"2026-07-05T05:49:03Z"}],"graph_snapshots":[{"event_id":"sha256:d3988bbcc7c9ef0083b7a5531e26a75682c09ec9d8820c730bb67a5e1efce907","target":"graph","created_at":"2026-07-05T05:49:03Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1904.02308/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Measuring the effect of peers on individuals' outcomes is a challenging problem, in part because individuals often select peers who are similar in both observable and unobservable ways. Group formation experiments avoid this problem by randomly assigning individuals to groups and observing their responses; for example, do first-year students have better grades when they are randomly assigned roommates who have stronger academic backgrounds? In this paper, we propose randomization-based permutation tests for group formation experiments, extending classical Fisher Randomization Tests to this set","authors_text":"Avi Feller, Guillaume Basse, Panos Toulis, Peng Ding","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2019-04-04T02:05:04Z","title":"Randomization tests for peer effects in group formation experiments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.02308","kind":"arxiv","version":3},"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":"sha256:5cde75c2b5dbb5178dd98dd38faa7e9fbacf75f506888a1c347918de9c790550","target":"record","created_at":"2026-07-05T05:49:03Z","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":"8a232c8dd1cfd1988be96ad535a261fc7b6249d72e506520b5ea1a636ff743d7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"stat.ME","submitted_at":"2019-04-04T02:05:04Z","title_canon_sha256":"e015ba5d77ff75a326c007e47a923958e4284a2e91d9071324342de3f547f7c6"},"schema_version":"1.0","source":{"id":"1904.02308","kind":"arxiv","version":3}},"canonical_sha256":"8165e309ec9bef803c13c31ca4bb18a4c16dd12bde9df46e8731e195c94d1547","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8165e309ec9bef803c13c31ca4bb18a4c16dd12bde9df46e8731e195c94d1547","first_computed_at":"2026-07-05T05:49:03.670019Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:49:03.670019Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZXkPVhC3hIdHjk56KYGWTfnqrloPMmKX62SEN/qQtgcMd4GwpL55RHzRiT1CGVsaDSke8rNvSOSKFSJ0uITZCg==","signature_status":"signed_v1","signed_at":"2026-07-05T05:49:03.670626Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.02308","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5cde75c2b5dbb5178dd98dd38faa7e9fbacf75f506888a1c347918de9c790550","sha256:d3988bbcc7c9ef0083b7a5531e26a75682c09ec9d8820c730bb67a5e1efce907"],"state_sha256":"e3185b3a59027ec321dec83eee125cd12c70a5a4e6e3e6675ef53859cf3d617a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mqCVRXKaIdsHKv61/dE3VAe1F9Hw+33w+bG8XXd/uPyml610Egfj7PAcFkt2NwuhSNtRWDPGYfDL2QE+EoZ9Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T02:25:40.847414Z","bundle_sha256":"8637fc534afaa9685d86a56b16b0353b59b9ed8b6ef24f9aac086603226a3c51"}}