MindMap Gallery Medical Information Retrieval - Informetrics
Informetrics is an expansion and evolution based on traditional bibliometrics and scientometrics. It mainly studies the measurement of intelligence information (or bibliometrics).
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Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
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[Zootopia Character Relationship Chart] The idealistic rabbit police officer Judy and the cynical fox conman Nick form a charmingly contrasting duo, rising from street hustlers to become Zootopia police officers!
Informetrics
definition
It is expanded and evolved on the basis of traditional bibliometrics and scientometrics. It mainly studies the measurement issues of intelligence information (or bibliometrics).
research content
Discussion on some basic issues in informometrics
basic measure of information
Study on several basic laws
Research on information flow model
Discussion on information and quantitative methods
Research on the automated implementation of information measurement methods and tools
Applications in the fields of library and information work, information resource management, information retrieval, information analysis and prediction, science and scientific evaluation, etc.
Document information flow characteristics
static properties
The distribution properties of scientific literature in space within a certain period of time Such as the regularity of concentrated discrete distribution, citation distribution, etc.
dynamic characteristics
Refers to the growth and aging of scientific literature over time Growth is the main trend in document information flow
three laws
Spatial distribution rules of scientific and technological documents
Bradford's Law
The distribution of documents in journals follows this law It is a rule that quantitatively describes the concentration and discreteness of scientific papers in relevant journals.
Mainly used to study the distribution of journal documents in a certain subject area and determine core journals
zoning rules
Divide journals containing articles in a certain research field 3 areas: core area, related area, discrete area
If the ratio of the number of journals in the three regions satisfies n1:n2:n3=1:a:a2 Where n1, n2, n3 are the number of journals in the three regions a is the Bradford coefficient, a>1
Its distribution pattern conforms to Bradford's law
Word frequency distribution rules of scientific and technological literature
Zip's law
Fundamental
Zipf's first law
The law of least effort Propose the concepts of "single force" and "diversified force"
Basic principles of Zipf's law Text and image description of the law Text description: f r r = C Image description: Hyperbola in Cartesian coordinate system A straight line in a logarithmic coordinate system
Limitations of Zipf's Law There are deficiencies in the explanation of high-frequency words and low-frequency words
Distribution rules of authors of scientific and technological documents
Lotka's law
Uncovering scientific productivity and the quantitative relationship between authors and papers
During a certain period of time, the number of authors who wrote X papers as a percentage of the total number of authors fx is inversely proportional to the square of the number of papers they wrote X
Webometrics
A discipline that comprehensively uses bibliometrics, information measurement, statistical methods, computer technology, etc. to conduct quantitative analysis of network information patterns.
Citation and citation analysis
basic concept
citation
Also called cited documents or references.
Citation
Also called cited documents or source documents or source documents
Document B is mentioned or described in Document A Document B is called the citation of document A, Call document A the citation document of document B
Citations and reference relationships
Cited documents cited references
References cited by citing documents
citation network
The relationship structure of mutual citations in documents
Citation analysis
definition
Use various mathematical and statistical methods and logic such as comparison and induction This method is a bibliometric analysis method that analyzes the citation and citation phenomena of various analysis objects such as scientific journals, papers, and books to reveal their quantitative characteristics and inherent laws.
Citation behavior is a ubiquitous phenomenon in scientific activities and an indispensable part of scientific communication.
Citing motives: including normal motives and abnormal motives
basic method
direct analysis
Evaluate journals and papers based on citation count analysis
Citation clustering
The network relationship between citations reveals the subject structure and development trends
Citation analysis tools
Web of Science (SCI,SSCI,ESI,InCites,JCR)
SCI
SCI (science citation index)
SCI is based on S. C. Bradford's literature discrete law theory and E. Garfield's citation analysis theory. It analyzes academic journals through statistics such as the citation frequency of papers. and scientific research results to conduct multi-faceted evaluation studies to judge a The scientific research output performance of countries or regions, scientific research institutions, and individuals comes from Reflect its international academic level.
SSCI (Social Science Citation Index)
ESI (Essential science indicators)
A basic analysis and evaluation tool for measuring scientific research performance and tracking scientific development trends.
InCites (scientific research/discipline performance analysis platform)
Based on Web of Science data, it provides scientific research performance analysis of various disciplines and talent teams of the institution through diversified indicators and rich visualization effects.
JCR (Journal Citation Reports, Journal Citation Reports)
Statistics and calculations are conducted on citation and cited data, and indices such as Impact Factor are defined for each journal and reported.
Partition Partitioning based on the impact factors of journals included in SCI
Thomson Reuters division
The number of journals is evenly divided into four parts Four areas: Q1, Q2, Q3 and Q4
Chinese Academy of Sciences Division
The number of journals in the four areas is distributed in a pyramid shape from area 1 to area 4.
The number of magazines in Zone 1 and Zone 2 is relatively high, and they are basically top-level journals.
Chinese Social Sciences Citation Index (CSSCI)
Chinese Social Sciences Citation Index (CSSCI)
Chinese Science Citation Database (CSCD)
China Science and Technology Papers and Citation Analysis Database (CSTPC)
Chinese Humanities and Social Sciences Citation Database
China Citation Database
Journal evaluation indicators
High concentration of cited documents
main indicators
Impact Factor (IF)
The number of citations of papers published in a journal in the previous two years in that year➗ The total number of papers published in the journal in the past two years
It is the average number of citations of papers published in journals within a specified period of time. It is an indicator of journal usage and quality.
The bigger, the higher the quality
Immediacy Index
The number of citations of papers published in the journal in a certain year ➗The number of papers published in that year
Journal article count
The total number of articles in the journal and the journal’s ability to produce articles
Journal citation rate
Number of total references, journal’s ability to absorb external literature
Journal citation rate
Total number of citations, user-rated journals
average citation rate
average citation rate, average citation rate
Journal self-citation rate
Number of citations to the journal’s own published papers ➗Total number of journal references
Journal self-citation rate
Number of times cited by the journal itself ➗Total number of times cited by the journal
half life
Refers to the period of time during which the newer half of all the currently used literature in a certain discipline (major) was published
price index
(Number of cited documents published less than 5 years ago ➗Total number of cited documents) *100%
a certain subject area The larger the Price index, the shorter the half-life, indicating that the literature ages faster.
H Index
That is, "high citations"
A person’s h-index refers to the number of publications he published within a certain period of time At least h papers must be cited no less than h times
The higher a person's h-index is, the more influential his paper is.
Innovative indicators determined based on the "quality" and "quantity" aspects of the paper
A high H index not only indicates that the evaluation object has high quality publications, but also has a large number of high-quality papers.
Application of JCR in journal evaluation
Determine core journals
Find the journals cited by this journal and sort them by their total number of citations or impact factors
Journal Aging Research
Half-life data
Comprehensive evaluation of journals
Determine the nature of the subject, etc.
Citation network and cluster analysis
citation coupling
In the same year, papers that cite a paper at the same time are called couplings
Measurement of coupling strength: number of shared references
co-citation
Both papers were cited by subsequent documents at the same time
Citation coupling analysis
Study the internal structure of the discipline, divide the clusters of papers that are similar in specialty and have high coupling strength, and provide the connections between clusters with different density to form a citation network that affects each other.
Co-citation analysis
Co-citation reflects the relationship between two cited documents