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Products that do what The Two by Two Truth Diagram does

I am diagnostic radiologist with over 40 years experience. In diagnostic testing, many terms are used to describe how well the test detects the disease or disorder. Examples are “sensitivity”, “specificity”, “predictive values”, “odds ratio”, “likelihood ratios” and numerous others. In the literature and medical presentations there is often not much consistency in their use; as a physician listening to or reading research, I was perpetually unclear on how these terms “fit together”. My solution was to invent the visual 2 by 2 diagram, or truth diagram, as a graphical alternative to the…

  1. 1
    Numeracy203

    A SQL pad that gives you x-ray vision for your data

    2017

  2. 2

    Reveal the patterns in your users' lives that matter most

    2025

  3. 3

    Catalog of all chart types and tools to build them

    2017

  4. 4
    DiaChat102

    Create and edit diagrams easily using natural language

    2022

  5. 5

    A tool for generating diagrams and flowcharts from text.

    2020

  6. 6

    Real or GPT-3 generated - can you guess which one is which?

    2022

  7. 7
    MedUp30

    AI-powered medical search

    2024

  8. 8CL

    Hi HN! Disclaimer: A blog post[0] on this topic ended up on HN's front page recently (which had a link to GlacierMD) but I'd already written this whole "Show HN" spiel so I figured I'd submit it anyway. Hopefully this doesn't come across as too spammy! (The previous post was really more about the problem, not my proposed solution.) Anyway, thanks for checking out GlacierMD—a consumer health tool I've been hacking on for the last few months. I chose long COVID as the first condition because (sadly) lots of people have it[1] and the research is changing rapidly[2]. Unlike other health…

    2022 · glaciermd.com

  9. 9GC

    I've built an app that extracts interpretable 'circuits' from models using the GPT-2 architecture. These circuits reveal how specific inputs influence the probabilities of the next token in a sequence. While some tutorials present theoretical examples of how feedforward layers and attention heads may produce predictions, this app provides concrete examples of how information flows through an LLM. You can see, for example, the formation of features that search for simple grammatical patterns and trace their construction back to the use of more primitive features. Feel free to reach out with…

    2024 · peterlai.github.io

  10. 10RT

    Hey HN! Abboud Chaballout here - founder of Diagnoss - where we aim to free medical providers from the mundane. One of the tools we built reads clinicians' notes in real-time, as they are charting, to tee up diagnoses they can use for documentation purposes. You can try it here: (https://demo.diagnoss.com/) without downloading anything. The current workflow of doctors today requires them to (1) type out a patient encounter (e.g. "patient presents with chest pain") and then (2) use a search bar in their electronic health record system to search and add the chest pain diagnosis…

    2022 · diagnoss.com

  11. 11

    During the implementation of a huge high performance service. In order to keep context small (mainly for humans) I kept the specs into mermaid diagrams. When communicating with humans; diagrams were easy to follow and to remember. But when I asked the agent to implement what's in the diagram, most of the times it failed. So I came into conclusion that agents are good into writing mermaid diagrams but they are not good into reading them. I built graph2agent in order to deterministically (without inference :) ) convert mermaid diagrams into digestible rich text for agents. examples:…

    26d ago · graph2agent.github.io

  12. 12TA

    We’re building TheorIA— an open, high quality dataset of theoretical physics results: equations, derivations, definitions, and explanations — all in structured, machine- and human-readable JSON. Why? Physics is rich with beautiful, formal results — but most of them are trapped in PDFs, LaTeX, or lecture notes. That makes it hard to: - train symbolic/physics-aware ML models, - build derivation-checking tools, - or even just teach physics interactively. THEORIA fills that gap. Each entry includes: A result name (e.g., Lorentz transformations) Clean equations (AsciiMath) Straightforward…

    2025 · theoria-dataset.github.io

  13. 13IB

    I was struggling to understand neuroscience and the word associations between technical terms and where the locations are (anatomically) And quite some of my neuroscience friends are loving it.

    Dec 2025 · neuroglance.labs.memebu.com

  14. 14BD
  15. 15DC

    Hi there! I'm building Diagrammatic, a simple and free online tool with the ambition to become a community for diagrams-as-code enthusiasts. Currently, it supports Mermaid, PlantUML, Dot (Graphviz), Vega-Lite, and Typogram, but I'm looking to add more languages. Please let me know if there's a particular one you use. I'd appreciate any kind of constructive feedback as well. Thanks in advance!

    2024 · diagrammatic.com

  16. 16DE

    Hi HN! I built this after seeing several references to Election Truth Alliance on social media, and after reading their analysis, I just couldn't get the problems I saw in it out of my head. So I downloaded the data, and rebuilt their full analysis from scratch. Their critical error is a simple misunderstanding of the Law of Large Numbers: values collected in large samples converge to the true probability in the sample distribution. (not to be confused with the Law of Very Large Numbers: which states that unlikely things happen given enough time. That confused me too) Technical Details: - No…

    2025 · sullivan.zip

  17. 17CY

    A quick game to test and sharpen your data visualization design skills. Choose the better chart in 17 head-to-head matchups & learn something new with each one!

    2025 · matplotlib-journey.com

  18. 18Q

    This is a side project we did. We call it q1tifier (pronounced 'quantifier') and it's main aim is to make sense of numbers. E.g. if you search for the number '5000' one of the result is '5000m = about the length of 89 NASA Space Shuttles' (see it here! http://duuble.com/q1tifier/view/3/=5000) Numbers don't really mean anything by themselves, so through this such numbers could be more meaningful! This idea spawned from seeing infographics that often compare numbers we real life stuff, and we decided to make a database for people to supply such small pieces of info and facts. The database is…

    2011

  19. 19AP

    This demo collects patient information in an open-ended and conversational format and then writes a preliminary medical note based on patient responses. Many GPT-3 applications focus on GPT answering user queries; here, we flip it around, with the system asking the user instead. I think open-ended conversational question-asking (that maintains long-term coherence, for which we use SNOMED-CT ontology and some rules) is especially important in medicine. Most existing systems rely on multiple-choice questions with a heavy amount of medical reasoning, but that’s very hard to get right. You can’t…

    2023 · auxhealth.io

  20. 20QA

    Q12 is a new web-based 2D parametric drawing tool built specifically for geometric problem solving, for playing interactive "what if" games with drawings, and for the design and optimization of mechanisms. Q12 has the usual set of drawing constraints found in other CAD tools (e.g. "lines are parallel") but also supports inequality constraints, area constraints, and arbitrary expressions between geometric quantities. We built Q12 to solve problems like those below, after finding that existing CAD systems couldn't handle them well: * Given dimensions on a surveyor's map, figure out if the…

    Feb 2026 · q12.app

  21. 21TM

    Hi HN, My name is Sapiens. I started learning about Reason and Science well into my 30s. I'd be fair to say that the Skeptic and Humanist communities saved my soul. So I made a mind-calibration tool in service of the cause. It's an app that quizzes the user about myths and misconceptions. By exploiting the resulting cognitive dissonance, it helps retune the user's confidence levels in their beliefs and improves their mental models. The tool uses Brier's so-called "proper" scoring system, a ruthless squared-error-loss scale (Brier scoring is widely used by intelligence agencies to align their…

    2025 · memevaccine.com

  22. 22AC
  23. 23DD

    2022 · diagramify.agiliq.com

  24. 24VG

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