Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2001012816', 'doi': 'https://doi.org/10.1007/s10651-013-0255-2', 'title': 'Variances and variance estimators of the improved ratio estimators under adaptive cluster sampling', 'display_name': 'Variances and variance estimators of the improved ratio estimators under adaptive cluster sampling', 'publication_year': 2013, 'publication_date': '2013-06-08', 'ids': {'openalex': 'https://openalex.org/W2001012816', 'doi': 'https://doi.org/10.1007/s10651-013-0255-2', 'mag': '2001012816'}, 'language': 'en', 'primary_location': {'is_oa': False, 'landing_page_url': 'https://doi.org/10.1007/s10651-013-0255-2', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S43170165', 'display_name': 'Environmental and Ecological Statistics', 'issn_l': '1352-8505', 'issn': ['1352-8505', '1573-3009'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310319900', 'host_organization_name': 'Springer Science+Business Media', 'host_organization_lineage': ['https://openalex.org/P4310319965', 'https://openalex.org/P4310319900'], 'host_organization_lineage_names': ['Springer Nature', 'Springer Science+Business Media'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref'], '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/A5043840234', 'display_name': 'Feng-Min Lin', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I91807558', 'display_name': 'National Cheng Kung University', 'ror': 'https://ror.org/01b8kcc49', 'country_code': 'TW', 'type': 'education', 'lineage': ['https://openalex.org/I91807558']}], 'countries': ['TW'], 'is_corresponding': False, 'raw_author_name': 'Feng-Min Lin', 'raw_affiliation_strings': [' National Cheng-Kung University'], 'affiliations': [{'raw_affiliation_string': ' National Cheng-Kung University', 'institution_ids': ['https://openalex.org/I91807558']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5057492331', 'display_name': 'Chang-Tai Chao', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I91807558', 'display_name': 'National Cheng Kung University', 'ror': 'https://ror.org/01b8kcc49', 'country_code': 'TW', 'type': 'education', 'lineage': ['https://openalex.org/I91807558']}], 'countries': ['TW'], 'is_corresponding': False, 'raw_author_name': 'Chang-Tai Chao', 'raw_affiliation_strings': [' National Cheng-Kung University'], 'affiliations': [{'raw_affiliation_string': ' National Cheng-Kung University', 'institution_ids': ['https://openalex.org/I91807558']}]}], 'institution_assertions': [], 'countries_distinct_count': 1, 'institutions_distinct_count': 1, 'corresponding_author_ids': [], 'corresponding_institution_ids': [], 'apc_list': {'value': 2290, 'currency': 'EUR', 'value_usd': 2890, 'provenance': 'doaj'}, 'apc_paid': None, 'fwci': 0.538, 'has_fulltext': True, 'fulltext_origin': 'ngrams', 'cited_by_count': 5, 'citation_normalized_percentile': {'value': 0.680557, 'is_in_top_1_percent': False, 'is_in_top_10_percent': False}, 'cited_by_percentile_year': {'min': 80, 'max': 82}, 'biblio': {'volume': '21', 'issue': '2', 'first_page': '285', 'last_page': '311'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T13030', 'display_name': 'Statistical Methods for Sensitive Survey Questions', 'score': 1.0, '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/T13030', 'display_name': 'Statistical Methods for Sensitive Survey Questions', 'score': 1.0, '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/T11860', 'display_name': 'Global Epidemiology of HIV and Drug Use', 'score': 0.966, 'subfield': {'id': 'https://openalex.org/subfields/2713', 'display_name': 'Epidemiology'}, 'field': {'id': 'https://openalex.org/fields/27', 'display_name': 'Medicine'}, 'domain': {'id': 'https://openalex.org/domains/4', 'display_name': 'Health Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/bootstrapping', 'display_name': 'Bootstrapping (finance)', 'score': 0.5487077}, {'id': 'https://openalex.org/keywords/estimation-methods', 'display_name': 'Estimation Methods', 'score': 0.531099}, {'id': 'https://openalex.org/keywords/respondent-driven-sampling', 'display_name': 'respondent-driven sampling', 'score': 0.510921}, {'id': 'https://openalex.org/keywords/survey-sampling', 'display_name': 'Survey Sampling', 'score': 0.506885}, {'id': 'https://openalex.org/keywords/ratio-estimator', 'display_name': 'Ratio estimator', 'score': 0.5042223}, {'id': 'https://openalex.org/keywords/extremum-estimator', 'display_name': 'Extremum estimator', 'score': 0.47077844}, {'id': 'https://openalex.org/keywords/univariate', 'display_name': 'Univariate', 'score': 0.44013953}], 'concepts': [{'id': 'https://openalex.org/C185429906', 'wikidata': 'https://www.wikidata.org/wiki/Q1130160', 'display_name': 'Estimator', 'level': 2, 'score': 0.85618997}, {'id': 'https://openalex.org/C105795698', 'wikidata': 'https://www.wikidata.org/wiki/Q12483', 'display_name': 'Statistics', 'level': 1, 'score': 0.8073344}, {'id': 'https://openalex.org/C33923547', 'wikidata': 'https://www.wikidata.org/wiki/Q395', 'display_name': 'Mathematics', 'level': 0, 'score': 0.74036545}, {'id': 'https://openalex.org/C44249647', 'wikidata': 'https://www.wikidata.org/wiki/Q208498', 'display_name': 'Confidence interval', 'level': 2, 'score': 0.63855535}, {'id': 'https://openalex.org/C139945424', 'wikidata': 'https://www.wikidata.org/wiki/Q1940696', 'display_name': 'Mean squared error', 'level': 2, 'score': 0.5811796}, {'id': 'https://openalex.org/C207609745', 'wikidata': 'https://www.wikidata.org/wiki/Q4944086', 'display_name': 'Bootstrapping (finance)', 'level': 2, 'score': 0.5487077}, {'id': 'https://openalex.org/C118248890', 'wikidata': 'https://www.wikidata.org/wiki/Q7295738', 'display_name': 'Ratio estimator', 'level': 5, 'score': 0.5042223}, {'id': 'https://openalex.org/C129848803', 'wikidata': 'https://www.wikidata.org/wiki/Q2564360', 'display_name': 'Sample size determination', 'level': 2, 'score': 0.5000622}, {'id': 'https://openalex.org/C68805675', 'wikidata': 'https://www.wikidata.org/wiki/Q5422477', 'display_name': 'Extremum estimator', 'level': 4, 'score': 0.47077844}, {'id': 'https://openalex.org/C17648541', 'wikidata': 'https://www.wikidata.org/wiki/Q2265984', 'display_name': 'Efficiency', 'level': 3, 'score': 0.45998377}, {'id': 'https://openalex.org/C199163554', 'wikidata': 'https://www.wikidata.org/wiki/Q1681619', 'display_name': 'Univariate', 'level': 3, 'score': 0.44013953}, {'id': 'https://openalex.org/C196083921', 'wikidata': 'https://www.wikidata.org/wiki/Q7915758', 'display_name': 'Variance (accounting)', 'level': 2, 'score': 0.4252649}, {'id': 'https://openalex.org/C183380357', 'wikidata': 'https://www.wikidata.org/wiki/Q1776598', 'display_name': 'Cluster sampling', 'level': 3, 'score': 0.41916496}, {'id': 'https://openalex.org/C191393472', 'wikidata': 'https://www.wikidata.org/wiki/Q15222032', 'display_name': 'Bias of an estimator', 'level': 4, 'score': 0.41037318}, {'id': 'https://openalex.org/C149782125', 'wikidata': 'https://www.wikidata.org/wiki/Q160039', 'display_name': 'Econometrics', 'level': 1, 'score': 0.3967073}, {'id': 'https://openalex.org/C143791395', 'wikidata': 'https://www.wikidata.org/wiki/Q475208', 'display_name': 'M-estimator', 'level': 3, 'score': 0.38619995}, {'id': 'https://openalex.org/C2908647359', 'wikidata': 'https://www.wikidata.org/wiki/Q2625603', 'display_name': 'Population', 'level': 2, 'score': 0.33221224}, {'id': 'https://openalex.org/C165646398', 'wikidata': 'https://www.wikidata.org/wiki/Q3755281', 'display_name': 'Minimum-variance unbiased estimator', 'level': 3, 'score': 0.2687697}, {'id': 'https://openalex.org/C161584116', 'wikidata': 'https://www.wikidata.org/wiki/Q1952580', 'display_name': 'Multivariate statistics', 'level': 2, 'score': 0.12484297}, {'id': 'https://openalex.org/C149923435', 'wikidata': 'https://www.wikidata.org/wiki/Q37732', 'display_name': 'Demography', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C144024400', 'wikidata': 'https://www.wikidata.org/wiki/Q21201', 'display_name': 'Sociology', 'level': 0, 'score': 0.0}, {'id': 'https://openalex.org/C121955636', 'wikidata': 'https://www.wikidata.org/wiki/Q4116214', 'display_name': 'Accounting', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C144133560', 'wikidata': 'https://www.wikidata.org/wiki/Q4830453', 'display_name': 'Business', 'level': 0, 'score': 0.0}], 'mesh': [], 'locations_count': 1, 'locations': [{'is_oa': False, 'landing_page_url': 'https://doi.org/10.1007/s10651-013-0255-2', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S43170165', 'display_name': 'Environmental and Ecological Statistics', 'issn_l': '1352-8505', 'issn': ['1352-8505', '1573-3009'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310319900', 'host_organization_name': 'Springer Science+Business Media', 'host_organization_lineage': ['https://openalex.org/P4310319965', 'https://openalex.org/P4310319900'], 'host_organization_lineage_names': ['Springer Nature', 'Springer Science+Business Media'], 'type': 'journal'}, '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': 20, 'referenced_works': ['https://openalex.org/W1490441963', 'https://openalex.org/W1495901321', 'https://openalex.org/W182003684', 'https://openalex.org/W1972137089', 'https://openalex.org/W1980869687', 'https://openalex.org/W1986050895', 'https://openalex.org/W1988157143', 'https://openalex.org/W2001947543', 'https://openalex.org/W2019491306', 'https://openalex.org/W2032036069', 'https://openalex.org/W2049655681', 'https://openalex.org/W2057725660', 'https://openalex.org/W2061965777', 'https://openalex.org/W2072321640', 'https://openalex.org/W2083800956', 'https://openalex.org/W2091840866', 'https://openalex.org/W2092322680', 'https://openalex.org/W2103212156', 'https://openalex.org/W2288201536', 'https://openalex.org/W4233471163'], 'related_works': ['https://openalex.org/W3166338889', 'https://openalex.org/W3102788604', 'https://openalex.org/W3046305609', 'https://openalex.org/W2994810832', 'https://openalex.org/W2962707289', 'https://openalex.org/W2943926017', 'https://openalex.org/W2087649161', 'https://openalex.org/W2077290129', 'https://openalex.org/W1984619412', 'https://openalex.org/W12718967'], 'abstract_inverted_index': None, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2001012816', 'counts_by_year': [{'year': 2024, 'cited_by_count': 1}, {'year': 2018, 'cited_by_count': 1}, {'year': 2017, 'cited_by_count': 1}, {'year': 2016, 'cited_by_count': 1}, {'year': 2015, 'cited_by_count': 1}], 'updated_date': '2024-09-15T13:23:50.714554', 'created_date': '2016-06-24'}