mesh indexing and subheading revision - imicams.ac.cn · zmajor topic versus subjects ... zmost...
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MeSH Indexing and Subheading Revision
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Preliminary ThoughtsWhy Index Rather than Use Search Engine?
Facilitate Consistent Retrieval Improve Precision
Why Should Others Index?Material Not in MEDLINETopics Not Covered Well?
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Preliminary Thoughts (Part 2)Why Use MeSH?
Cost of Maintenance and UpdateCombining Searches
Why Stay Current?Science Marches On
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Indexing PhilosophyWhat is Paper About?
Not what is relevantNot what is mentionedNot what it may be important to
Practice Makes BetterCover All Aspects of An Article
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General Indexing Practices8 - 15 Headings AssignedMost Specific Possible
Rule of ThreeMajor Topic versus Subjects Discussed
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Example of Indexing
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Finding a DescriptorUse MeSH Browser
TermString Search
Print EditionsEntry Terms
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Understanding The Record
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Check Tags Looked For RoutinelyImportant for Narrowing SearchesAges for Human OnlyPregnancy, Always Use Female as WellAnimals
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List of Check TagsHumanMaleFemaleAgedMiddle-AgedAdultAged, 80 AND OverAdolescentChildChild, Pre-SchoolInfantInfant, Newborn
Animals MiceRatsRabbitsCatsCattleDogsIn VitroComparative StudyEnglish AbstractResearch Support
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TreesMeaning of HierarchyAdvantage of PolyhierarchyAutomatic Explosions
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QualifiersSometimes Called SubheadingsSpecifying Aspects of SubjectUsed by Searchers in Narrowing SearchAllowable Values Specific to DescriptorGroups Easily Confused
Adverse Effects-Poisoning-ToxicityChemistry-Analysis
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Understanding the RecordQualifiers
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Entry CombinationsPre-Coordinated TermMost Indexing Post-Coordination“Representational Integrity”Descriptor Qualifier Combination Prohibited
Replaced by Pre-Coordinated TermQualifier not Allowable
ExamplesEnzyme/deficiency And Disease caused by DeficiencyOrgan/transplantaion and Organ Transplantation
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CoordinationFundamental Aspect of MEDLINE indexingMultiple Headings, multiple qualifiersAllows Complexity of ExpressionAllows Refinement of Searches
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Use of Coordination First- Descriptors for TopicsSecond-Qualifiers for DescriptorsThird - Coordination of Qualifiers
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Current Difficulties
Retrieval AspectsRepresentational Integrity“Special” Meanings
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Brief Reminders
RecallPercent of Relevant Found By Search
PrecisionPercent of Those Found Which Are Relevant
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Retrieval Effects
Variety of StudiesIndexing ConsistencyEmpirical Studies
Recall for Subheading Alone 40-50%Recall For MH/sh Combinations Even LowerMissing Significant Numbers of Relevant Citations
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Representational Integrity
One Meaning – One ExpressionWhy We Use Thesauri Overlap in MeaningAdversely Affect Retrieval
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Example: Diet Therapy and Hyperlipidemia
Role of Diet in Treatment of High Cholesterol and TriglyceridesWhat Search Strategy?
hyperlipidemia/diet therapy [mj] AND human [mh]hyperlipidemia [mj] AND human [mh] AND diet [mh]hyperlipidemia [mj] AND human [mh] AND diet therapy [mh]
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Overlapping Meanings
Chemistry and Analysis“do not confuse” with analysis, isolation and purification, metabolism, pharmacokinetics
Poisoning and ToxicityPrevention and ControlSupply and Manpower
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“Special” Meanings
Meanings Not In Common UseOften Much NarrowerNot Readily UnderstoodRequires Special Training
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Examples
AbnormalitiesComplications
Only For DiseasesAdverse Effects for Procedures
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Implications for Searchers
Representational Integrity/Overlapping Meanings
Indexing and Retrieval Scattered“Special” Meanings
Retrievals May Be Swamped by Subgroup (Those With the “Special” Meaning)
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Hoped-For Outcomes
Improve RecallAccept Some Loss in Precision
More Consistency
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Criteria For Improvements
UnderstandabilityReproducibilityUsefulAs a WholeAs an Individual
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Comments and Suggestions
Better Names E.g., statistics and numerical data includes some non-numerical material. Data?Abnormalities. Birth Defects?
Altering Rules
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Implementation (MeSH)
Review Entry CombinationsChange Heading and SCR RecordsConsolidate Indexing Rules
Review Annotations�
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Implementation (Other)
DCMS ChangesTraining MaterialsIndexing ManualCitation MaintenanceCataloging Maintenance