8 years! Oh the satisfaction. Three different Dewey Decimal based analysis at three different years, using several VERY different AI classification systems in 2015, then 2021, then 2023, all together now.*

8 years!
Oh the satisfaction. Three different Dewey Decimal based analysis at three different years, using several VERY different AI classification systems in 2015, then 2021, then 2023, all together now.*

YEARS DDC Subject
2015 0 Computer science, knowledge & systems
20152023 1 Knowledge
2023 1.4 Research
2021 1.64 Special Purpose Computing
2021 1.9 General Themes in Knowledge
2015 3 Systems
2021 3.3 Computer Simulation
20152021 4 Data processing & computer science
2021 4.0151 Machine Theory
2021 4.22 Embedded Computer Systems
2021 4.6 Computer Networks – Synchronization
2023 4.678 Computer graphics
2015 5 Computer programming, programs & data
20212023 5.1 Computer Algorithms
2021 5.13 Object-Oriented Programming
2021 5.131 Computer Science – Rewriting Systems
2021 5.43 Operating Systems
2015 6 Special computer methods
2021 6.216 Computational Complexity
20212023 6.3 Artificial Intelligence
2021 6.31 Machine Learning
2021 6.312 Data Mining
2021 6.32 Neural Networks
2021 6.35 Natural Language Processing
2021 6.6 Computer Graphics
2021 6.758 Videotex Systems
20152021 20 Library & information sciences
2015 21 Library relationships
2015 22 Administration of physical plant
2015 25 Library operations
2021 25.042 Information Storage and Retrieval Systems
2021 25.3 Abstracting and Indexing
2015 27 General libraries
2015 28 Reading & use of other information media
201520212023 100 Philosophy
2015 110 Metaphysics
2021 110.1 Metaphysics – Categories
2021 111 Metaphysics – Ontological Concepts
2023 111.8 Eastern philosophy
2021 111.85 Aesthetics – Ancient
2021 113 Metaphysics – Creation
2023 114 Space
201520212023 115 Time
2015 120 Epistemology, causation & humankind
2021 121 Epistemology
2021 121.6 Underdetermination in Theory of Knowledge
20212023 121.68 Epistemology – Analogy
2015 122 Causation
20212023 128.2 Philosophy of Mind
2021 133 Occultism
2021 133.333 Feng Shui
2021 133.5 Astrology
2021 133.8 Parapsychology
2023 142.7 Transpersonal psychology
20152021 150 Psychology
2021 150.19 Psychology – Functionalism
2021 152.14 Psychology – Perception
2021 152.15 Psychology – Time Perception
2021 152.4 Psychology – Optimism
2021 152.42 Psychology – Happiness
20212023 153 Cognitive Psychology
2023 153.1 Learning and memory
2021 153.12 Memory & Physiology
2021 153.14 Psychology – Mnemonics
2021 153.15 Learning and Memory
2021 153.35 Psychology – Creative Ability
2023 153.4 Attention and perception
2021 153.43 Psychology – Problem Solving
2023 153.6 Motivation
20212023 153.7 Psychology – Attention
2021 153.83 Decision Making
2021 153.9 Psychology – Multiple Intelligences
2021 155 Developmental Psychology
20212023 155.2 Developmental Psychology – Self-Esteem
2021 155.232 Developmental Psychology – Introversion
2021 155.4 Developmental Psychology – Child Development
2021 155.5 Developmental Psychology
2023 155.9 Environmental psychology
2021 155.9042 Developmental Psychology – Stress
20212023 158.1 Adjustment and Personal Development
20212023 158.12 Psychology – Meditation
20212023 160 Logic
20212023 170 Ethics
2021 177.7 Ethics – Caring
2021 179.3 Ethics – Human-Animal Relationships
2021 179.6 Ethics – Courage
2015 190 Modern western philosophy
2021 191 Quine, W. V. (Willard Van Orman) – Philosophy
2021 194 Deleuze, Gilles – Philosophy
201520212023 200 Religion
2021 204 Spirituality
2023 204.4 Stress management
2015 290 Other religions
201520212023 300 Social sciences, sociology & anthropology
20152021 301 Sociology & anthropology
20152021 302 Social interaction
2021 302.14 Social Skills
2023 302.2 Communication
2023 302.23 Social interaction
2015 303 Social processes
2021 303.49 Social Prediction
2021 305 Social Groups
2021 305.8 Sociology – Cultural Pluralism
20152021 306 Culture & institutions
2021 306.1 Furry Fandom – Social Aspects
2021 306.3 Sociology – Lifestyles
2021 306.38 Sociology – Retirement
2021 306.481 Culture – Fandom
2015 310 Statistics
20152023 320 Political science
20152023 330 Economics
2015 331 Labor economics
2021 331.702 Labor Economics – Vocational Guidance
2015 332 Financial economics
2015 333 Economics of land & energy
2015 336 Public finance
2021 336.207 Transfer Payments
2015 337 International economics
2015 338 Production
2021 338.542 Economic Forecasting
2021 338.9 Economic Assistance
2015 339 Macroeconomics & related topics
2021 339.47 Economics – Consumption
2015 340 Law
2021 342.730853 Freedom of Information
2021 355.4 Military Strategy
2015 360 Social problems & social services
20212023 361 Social Welfare and Public Services
2021 361.61 Services for the Poor
2021 362 Public Health
2021 362.5 Social Services – Families
2021 362.556 Public Welfare – Brazil
2021 363.34 Disaster Relief
2021 363.348 Emergency Food Supply
2021 363.61 Emergency Water Supply
201520212023 370 Education
2021 370.152 Education – Learning
2021 371.95 Education – Gifted Children
2015 380 Commerce, communications & transportation
2015 381 Commerce
2021 384.3 Information Policy
20152021 390 Customs, etiquette & folklore
2021 391 Costume – Social Aspects
2021 395 Manners and Customs
2015 400 Language
2015 401 Philosophy & theory
2021 401.43 Linguistics – Semantics
20152021 410 Linguistics
2021 410.285 Computational Linguistics
2021 415 Linguistics – Grammar
2021 418 Applied Linguistics
2021 418.0071 Linguistics – Second Language Acquisition
2015 430 German & related languages
20152021 500 Natural sciences & mathematics
2021 501 Philosophy of Science
2021 507 Science – Research Methodology
2021 507.2 Science – Methodology
2023 509 History and philosophy of science
201520212023 510 Mathematics
2021 510.1 Metamathematics
2021 510.71 Mathematics Education & Social Aspects
2021 510.92 Biography – Mathematicians (Richard)
2015 511 General principles of mathematics
2021 511.3 Computational Complexity
2021 511.32 Set Theory – Axiomatic Set Theory
2021 511.322 Descriptive Set Theory
2021 511.35 Lambda Calculus
2021 511.5 Graph Theory
2021 511.6 Combinatorial Analysis
20152021 512 Algebra
2021 512.2 Algebra – Group Theory
2021 512.5 Ordered Algebraic Structures
2021 512.7 Number Theory
20152021 514 Topology
2021 514.74 Geometry – Fractals
2015 515 Analysis
2021 515.39 Differentiable Dynamical Systems
2021 515.42 Ergodic Theory
2021 515.94 Topology – Transformation Groups
20152021 516 Geometry
2021 516.01511 Geometry – Data Processing
2021 516.15 Geometry – Shapes
2021 516.21 Geometry – Voronoi Polygons
2015 518 Numerical analysis
2015 519 Probabilities & applied mathematics
2021 519.7 Information Theory
201520212023 520 Astronomy
2021 520.92 Astronomy – Biographies
2021 523.1 Cosmology
2021 523.7 Plasma Astrophysics
201520212023 530 Physics
2021 530.01 Philosophy of Physics
2021 530.12 Quantum Theory
2021 530.13 Statistical Physics
2021 530.14 Physics – Causality
2021 530.143 Quantum Electrodynamics – Dirac Equation
2021 530.41 Physics – Interfaces
2021 530.417 Physics – Surfaces
20152021 531 Classical mechanics; solid mechanics
2021 531.14 Classical Mechanics – Friction
2021 531.6 Classical Mechanics – Force and Energy
20152021 532 Fluid mechanics; liquid mechanics
2015 535 Light & infrared & ultraviolet phenomena
2015 537 Electricity & electronics
2015 539 Modern physics
2021 539.7 Quantum Electrodynamics
20152023 540 Chemistry & allied sciences
2015 541 Physical chemistry
2021 541.3 Surface Chemistry
2021 541.395 Chemistry – Surface Active Agents
2021 541.6 Surface Chemistry
2021 548.5 Crystallography – Crystal Growth
2021 548.6 Crystallography – Epitaxy
2015 550 Earth sciences
2015 551 Geology, hydrology & meteorology
2021 551.22 Earthquakes
2021 551.63 Meteorology – Weather Forecasting
201520212023 570 Life sciences; biology
2021 570.1 Philosophy of Biology
2015 571 Physiology & related subjects
2021 571.2 Plant Physiology
2021 571.6 Cytology
2021 571.64 Plant Physiology – Cell Interaction
2021 571.7 Chronobiology
20152021 572 Biochemistry
2021 572.5 Biochemistry
2021 573.8 Neurobiology
2021 574.01 Biological Systems Theory
2021 576.8 Evolutionary Biology
20152021 580 Plants (Botany)
2015 590 Animals (Zoology)
20152021 600 Technology
20152021 610 Medicine & health
2021 610.28 Biomedical Engineering
2015 612 Human physiology
2021 612.132 Physiology – Microcirculation
2021 612.2 Physiology – Metabolism
20212023 612.8 Cognitive and Neurological Processes
2021 612.804 Physiology – Neurochemistry
2023 612.8042 Perception
2021 612.82 Cognitive Neuroscience
2021 612.85 Physiology – Hearing
20212023 613 Health
2021 613.7 Physical Fitness
2021 613.7046 Physical Fitness – Yoga
2021 613.713 Bodybuilding
2021 615 Pharmacology – Therapeutics
2021 615.53 Integrative Medicine
2021 615.851 Pharmacology – Therapeutic Use
2015 616 Diseases
2021 616.025 Emergency Medicine
2021 616.0252 First Aid
2021 616.462 Diabetes
2021 616.8 Brain Diseases
20212023 616.8527 Depression
2023 616.89 Mental health
2021 617 Surgery
2021 617.620285 Robotics in Medicine
20152021 620 Engineering & allied operations
2021 620.00151 Engineering Mathematics
2021 620.11 Engineering Materials
2021 620.5 Thin Films
2015 621 Applied physics
2021 621.367 Image Processing
2021 621.381 Electronics
2021 621.3815 Electrical Engineering – Transducers
2021 621.3822 Signal Processing
2021 621.38224 Digital Filters
2021 621.89 Lubrication
2015 623 Military & nautical engineering
2015 627 Hydraulic engineering
2015 629 Other branches of engineering
2021 629.8 Automatic Control
2021 629.8312 Adaptive Control Systems
2021 629.89 Mechatronics
2021 629.892 Robotics
2015 630 Agriculture
2021 640 Home Economics
2021 641 Cooking and Cuisine
2021 641.3 Food Storage
2021 641.5 Cooking
2021 641.52 Food Mixes
2021 641.555 Quick and Easy Cooking
2021 641.563 Natural Foods Cooking
2021 641.567 Jewish Cooking
2021 641.5784 Outdoor Cooking
2021 641.588 Slow Cooking
2021 641.5884 Electric Cooking
2021 641.594 European Cooking
2021 641.5941 British Cooking
2021 641.5973 American Cooking
2021 643 Do-It-Yourself Work
2021 646.204 Serging
2021 646.72 Cosmetics
2021 649 Child Rearing
2021 658.0412 Home-Based Businesses
2021 658.4012 Management – Forecasting
2021 658.4038 Management Information Systems
2021 658.827 Marketing – Brand Name Products
2021 658.872 Electronic Commerce
2015 660 Chemical engineering
2015 669 Metallurgy
2021 671.52 Vapor-Plating
2021 681.113 Horology – Clocks and Watches
2021 681.114 Horology – Clock and Watch Makers
2021 684.16 Rustic Woodwork
201520212023 700 Arts
2021 701.17 Art – Indic Aesthetics
2021 701.85 Art – Color Theory
2021 704.9436 Art – Anthropomorphism
2015 710 Landscaping & area planning
2015 720 Architecture
2021 741 Drawing Technique
2021 741.2 Drawing Technique – Doodles
20152023 780 Music
2021 781.11 Musical Perception
2021 781.2 Music Acoustics
2021 781.242 Musical Pitch
2021 783.043 Music – Voice Culture
2021 786.7 Electronic Musical Instruments
20152021 790 Sports, games & entertainment
2015 791 Public performances
2023 791.43 Film and video
2015 792 Stage presentations
2023 793 Indoor games and amusements
2023 794 Outdoor games and amusements
2021 794.8 Computer Games
2015 796 Athletic & outdoor sports & games
2015 800 Literature, rhetoric & criticism
2023 808 Rhetoric and collections of literary texts
2021 808.066 Technical Writing
2023 808.1 Rhetoric of creative writing
2023 808.5 Rhetoric and writing
2021 809.38766 Literature – Fantasy & Social Aspects
2023 809.933 Metaphor
2015 810 American literature in English
2015 820 English & Old English literatures
2015 830 German & related literatures
2015 900 History
20152021 910 Geography & travel
2015 930 History of ancient world
2015 940 History of Europe
2015 941 British Isles
2015 943 Central Europe; Germany
2021 981 Brazil – History & Geography

* 2015: Used ACT-DL – Digital Classification for Librarians (RIP, closed in 2022) and lots of Excel analysis, focusing much on “probability %’s” as prioritization was the focus. Analysis was on my writings as they were from 1989-2015, saved from online. data set: DOI: 10.17632/92825j2d2r.1 – used around 9500 samples out of 36000.

* 2021: Used WordStat 8 for Latent Dirichlet Analysis (LDA) which I performed with breakdowns from 1-99 “bag of words” topic groupings.

Then I combined the 1-99 to find common “master topics” – it’s impossible to fully align, say, 23 topics with 37 topics – but when you do all of them, surprising patterns emerge and they did.

Meanwhile I’d used LibraryThing first to store books I’d ACTUALLY read or owned (some aren’t my books such as cooking books but yeah, I’d read them too)

But more interestingly, I used it then to get representative books titles I _would_ read that are in topics I’m interested that I’d done WIKIPEDIA SEARCHES ON from 2013-2019.

I got those DDCs from those (618 books total), which I then looked up in the OCLC experimental classifier which gave me the FAST subject headings and Library of Congress equivalents when available, which for me was even MORE specific subjects to work with.

DATA SOURCES were three: writings from 1989-2015 and also the WIKIPEDIA searches I’d done from 2013-2020 of which I’d picked representative books in LibraryThing with their corresponding DDC numbers and then got EXTRA info from the OCLC FAST subject headings.

Unfortunately, I did not have the power in 2021 to DO anything with that extra information from OCLC – just the DDC stuff, so I sat on it … until 2023 with ChatGPT4.

2023: NEW ADDITIONAL DATA SOURCE:
ChatGPT Conversation Log Export: Dec 2, 2022 – May 5, 2023.

Saved Logs, printed to PDF, PDF to Text. Then ran LDA analysis using an online site as I no longer had WordStat 8 but it worked great! Ran those topic groupings through ChatGPT4 to get likely topics, and then take those likely topics to get equivalent Dewey Decimal numbers for each along with DDC names.

ALSO, I used ChatGPT4 to analyze the additional subjects provided by the LibraryThing Analysis AND ALSO ran a number of the WordStat LDA from 2021 through as well to get representative DDCs, which I put together as “2021”.

Excel with the workhorse inbetween all of it, including this portion, the lingua franca of all of this data but all the data was generated through either AI or a mix of AI and manual curation (such as book classifying)

So what I have here is a history of my results, compact.

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