Publication Information

{'id': 'https://openalex.org/W1988262403', 'doi': 'https://doi.org/10.2307/2531021', 'title': 'Sample-Size Formula for the Proportional-Hazards Regression Model', 'display_name': 'Sample-Size Formula for the Proportional-Hazards Regression Model', 'publication_year': 1983, 'publication_date': '1983-06-01', 'ids': {'openalex': 'https://openalex.org/W1988262403', 'doi': 'https://doi.org/10.2307/2531021', 'mag': '1988262403', 'pmid': 'https://pubmed.ncbi.nlm.nih.gov/6354290'}, 'language': 'en', 'primary_location': {'is_oa': False, 'landing_page_url': 'https://doi.org/10.2307/2531021', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S8265502', 'display_name': 'Biometrics', 'issn_l': '0006-341X', 'issn': ['0006-341X', '1541-0420'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310311648', 'host_organization_name': 'Oxford University Press', 'host_organization_lineage': ['https://openalex.org/P4310311647', 'https://openalex.org/P4310311648'], 'host_organization_lineage_names': ['University of Oxford', 'Oxford University Press'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref', 'pubmed'], 'open_access': {'is_oa': False, 'oa_status': 'closed', 'oa_url': None, 'any_repository_has_fulltext': False}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5044481779', 'display_name': 'David Schoenfeld', 'orcid': 'https://orcid.org/0000-0003-1948-3711'}, 'institutions': [], 'countries': [], 'is_corresponding': True, 'raw_author_name': 'David A. Schoenfeld', 'raw_affiliation_strings': [], 'affiliations': []}], 'institution_assertions': [], 'countries_distinct_count': 0, 'institutions_distinct_count': 0, 'corresponding_author_ids': ['https://openalex.org/A5044481779'], 'corresponding_institution_ids': [], 'apc_list': {'value': 3710, 'currency': 'USD', 'value_usd': 3710, 'provenance': 'doaj'}, 'apc_paid': None, 'fwci': 3.155, 'has_fulltext': True, 'fulltext_origin': 'ngrams', 'cited_by_count': 944, 'citation_normalized_percentile': {'value': 0.987094, 'is_in_top_1_percent': False, 'is_in_top_10_percent': True}, 'cited_by_percentile_year': {'min': 99, 'max': 100}, 'biblio': {'volume': '39', 'issue': '2', 'first_page': '499', 'last_page': '499'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T11235', 'display_name': 'Statistical Methods in Clinical Trials', 'score': 0.995, 'subfield': {'id': 'https://openalex.org/subfields/2613', 'display_name': 'Statistics and Probability'}, 'field': {'id': 'https://openalex.org/fields/26', 'display_name': 'Mathematics'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, 'topics': [{'id': 'https://openalex.org/T11235', 'display_name': 'Statistical Methods in Clinical Trials', 'score': 0.995, 'subfield': {'id': 'https://openalex.org/subfields/2613', 'display_name': 'Statistics and Probability'}, 'field': {'id': 'https://openalex.org/fields/26', 'display_name': 'Mathematics'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T10136', 'display_name': 'Statistical Methods and Inference', 'score': 0.9917, 'subfield': {'id': 'https://openalex.org/subfields/2613', 'display_name': 'Statistics and Probability'}, 'field': {'id': 'https://openalex.org/fields/26', 'display_name': 'Mathematics'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T11901', 'display_name': 'Bayesian Methods and Mixture Models', 'score': 0.9818, 'subfield': {'id': 'https://openalex.org/subfields/1702', 'display_name': 'Artificial Intelligence'}, 'field': {'id': 'https://openalex.org/fields/17', 'display_name': 'Computer Science'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/concomitant', 'display_name': 'Concomitant', 'score': 0.67444134}], 'concepts': [{'id': 'https://openalex.org/C33923547', 'wikidata': 'https://www.wikidata.org/wiki/Q395', 'display_name': 'Mathematics', 'level': 0, 'score': 0.6987068}, {'id': 'https://openalex.org/C105795698', 'wikidata': 'https://www.wikidata.org/wiki/Q12483', 'display_name': 'Statistics', 'level': 1, 'score': 0.67538124}, {'id': 'https://openalex.org/C2779384505', 'wikidata': 'https://www.wikidata.org/wiki/Q17007513', 'display_name': 'Concomitant', 'level': 2, 'score': 0.67444134}, {'id': 'https://openalex.org/C50382708', 'wikidata': 'https://www.wikidata.org/wiki/Q223218', 'display_name': 'Proportional hazards model', 'level': 2, 'score': 0.6343668}, {'id': 'https://openalex.org/C152877465', 'wikidata': 'https://www.wikidata.org/wiki/Q208042', 'display_name': 'Regression analysis', 'level': 2, 'score': 0.5042368}, {'id': 'https://openalex.org/C129848803', 'wikidata': 'https://www.wikidata.org/wiki/Q2564360', 'display_name': 'Sample size determination', 'level': 2, 'score': 0.48920035}, {'id': 'https://openalex.org/C2908647359', 'wikidata': 'https://www.wikidata.org/wiki/Q2625603', 'display_name': 'Population', 'level': 2, 'score': 0.4702239}, {'id': 'https://openalex.org/C83546350', 'wikidata': 'https://www.wikidata.org/wiki/Q1139051', 'display_name': 'Regression', 'level': 2, 'score': 0.46259513}, {'id': 'https://openalex.org/C28826006', 'wikidata': 'https://www.wikidata.org/wiki/Q33521', 'display_name': 'Applied mathematics', 'level': 1, 'score': 0.3703615}, {'id': 'https://openalex.org/C149782125', 'wikidata': 'https://www.wikidata.org/wiki/Q160039', 'display_name': 'Econometrics', 'level': 1, 'score': 0.36352313}, {'id': 'https://openalex.org/C71924100', 'wikidata': 'https://www.wikidata.org/wiki/Q11190', 'display_name': 'Medicine', 'level': 0, 'score': 0.17843494}, {'id': 'https://openalex.org/C99454951', 'wikidata': 'https://www.wikidata.org/wiki/Q932068', 'display_name': 'Environmental health', 'level': 1, 'score': 0.0}], 'mesh': [{'descriptor_ui': 'D004812', 'descriptor_name': 'Epidemiologic Methods', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': True}, {'descriptor_ui': 'D009026', 'descriptor_name': 'Mortality', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': True}, {'descriptor_ui': 'D002986', 'descriptor_name': 'Clinical Trials as Topic', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D006801', 'descriptor_name': 'Humans', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D012044', 'descriptor_name': 'Regression Analysis', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}, {'descriptor_ui': 'D012494', 'descriptor_name': 'Sampling Studies', 'qualifier_ui': '', 'qualifier_name': None, 'is_major_topic': False}], 'locations_count': 2, 'locations': [{'is_oa': False, 'landing_page_url': 'https://doi.org/10.2307/2531021', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S8265502', 'display_name': 'Biometrics', 'issn_l': '0006-341X', 'issn': ['0006-341X', '1541-0420'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310311648', 'host_organization_name': 'Oxford University Press', 'host_organization_lineage': ['https://openalex.org/P4310311647', 'https://openalex.org/P4310311648'], 'host_organization_lineage_names': ['University of Oxford', 'Oxford University Press'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, {'is_oa': False, 'landing_page_url': 'https://pubmed.ncbi.nlm.nih.gov/6354290', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4306525036', 'display_name': 'PubMed', 'issn_l': None, 'issn': None, 'is_oa': False, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1299303238', 'host_organization_name': 'National Institutes of Health', 'host_organization_lineage': ['https://openalex.org/I1299303238'], 'host_organization_lineage_names': ['National Institutes of Health'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}], 'best_oa_location': None, 'sustainable_development_goals': [], 'grants': [], 'datasets': [], 'versions': [], 'referenced_works_count': 7, 'referenced_works': ['https://openalex.org/W1970029232', 'https://openalex.org/W1970277362', 'https://openalex.org/W2080575571', 'https://openalex.org/W2138646672', 'https://openalex.org/W2328166860', 'https://openalex.org/W2403035479', 'https://openalex.org/W4285719527'], 'related_works': ['https://openalex.org/W4289356671', 'https://openalex.org/W31220157', 'https://openalex.org/W3083243621', 'https://openalex.org/W3034487859', 'https://openalex.org/W2800090224', 'https://openalex.org/W2389155397', 'https://openalex.org/W2387623956', 'https://openalex.org/W2312753042', 'https://openalex.org/W2165884543', 'https://openalex.org/W1963858542'], 'abstract_inverted_index': {'A': [0], 'formula': [1, 25], 'is': [2, 22, 63, 71, 91], 'derived': [3, 43], 'for': [4, 73], 'determining': [5], 'the': [6, 13, 44, 55, 66, 78], 'number': [7], 'of': [8, 15, 47, 50, 57, 84], 'observations': [9], 'necessary': [10], 'to': [11, 53, 65], 'test': [12, 54], 'equality': [14, 56], 'two': [16, 58], 'survival': [17, 59], 'distributions': [18], 'when': [19], 'concomitant': [20, 69, 89], 'information': [21, 70], 'incorporated.': [23], 'This': [24], 'should': [26], 'be': [27], 'useful': [28], 'in': [29], 'designing': [30], 'clinical': [31], 'trials': [32], 'with': [33], 'a': [34, 48], 'heterogeneous': [35], 'patient': [36], 'population.': [37], 'Schoenfeld': [38], '(1981,': [39], 'Biometrika': [40], '68,': [41], '316-319)': [42], 'asymptotic': [45], 'power': [46], 'class': [49], 'statistics': [51], 'used': [52], 'distributions.': [60], 'That': [61], 'result': [62], 'extended': [64], 'case': [67], 'where': [68, 77], 'available': [72], 'each': [74], 'individual': [75], 'and': [76], 'proportional-hazards': [79], 'model': [80], 'holds.': [81], 'The': [82], 'loss': [83], 'efficiency': [85], 'caused': [86], 'by': [87], 'ignoring': [88], 'variables': [90], 'also': [92], 'computed.': [93]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W1988262403', 'counts_by_year': [{'year': 2024, 'cited_by_count': 60}, {'year': 2023, 'cited_by_count': 68}, {'year': 2022, 'cited_by_count': 61}, {'year': 2021, 'cited_by_count': 72}, {'year': 2020, 'cited_by_count': 60}, {'year': 2019, 'cited_by_count': 58}, {'year': 2018, 'cited_by_count': 48}, {'year': 2017, 'cited_by_count': 45}, {'year': 2016, 'cited_by_count': 40}, {'year': 2015, 'cited_by_count': 40}, {'year': 2014, 'cited_by_count': 48}, {'year': 2013, 'cited_by_count': 32}, {'year': 2012, 'cited_by_count': 42}], 'updated_date': '2025-01-11T21:25:21.881587', 'created_date': '2016-06-24'}