Why Federal Reform Picks AI‑Native Outcome Integrators
Executive summary Federal procurement is shifting from labor-based buys toward fixed-price, outcome-focused contracts—and that change alters who wins …
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An IRT-shaped practice score is not an IQ test
IntelligenceMax updates a learner estimate after every answer and displays it on the familiar IQ scale. The arithmetic resembles item response theory.…
Design + Product Thinking: NYC’s Path to Reliable AI
Design + Product Thinking: NYC’s Path to Reliable AI AI delivers value when it’s useful, trusted, and operational. For city services that affect milli…
We graded 13 famous trading strategies on 6 years of data. All 13 failed.
( https://tessen.ai/strategies ) Every trading book, YouTube channel, and Discord server teaches the same classics: RSI mean-reversion, the golden cro…
A no-code way to scrape live World Cup betting odds
This World Cup has been full of upsets — Norway knocking out Brazil, Cabo Verde drawing with both Spain and Uruguay, all four pre-tournament favorites…
What Building an AI Detector Taught Me About False Positives
The first time we ran our AI content checker on a batch of student essays, one thing became immediately clear: the detector was more confident than we…
Meta-Analysis: Between-Study Heterogeneity
Adapted from an appendix of my MS thesis. Between-Study Heterogeneity The extent to which true effect sizes vary within a meta-analysis is called betw…
Scaffolding Business Domain Models with Dynamic Schemas
This article kicks off our new "Core Platform Capabilities" series Operational platforms require structured data, but rigid database schemas slow down…
Power BI DAX Essential Functions — Explained with Examples
If you’ve ever struggled with CALCULATE() or wondered why SUMX() behaves differently from SUM() , this guide is for you. DAX (Data Analysis Expression…
Your embedding axes can move while cosine neighbours stay put
An embedding can look substantially different after an orthogonal change of basis, even though its cosine similarities have not changed. I built a sma…
Bayesian Neural Networks
Adapted from an appendix of my MS thesis. Bayesian Neural Network Deep neural networks (DNNs) are usually trained using a regularized maximum likeliho…
Gaussian Process Classification
Adapted from an appendix of my MS thesis. Classification We have considered regression problems where the targets are real valued. Classification prob…
Memprediksi Peluang Klub Promosi Bertahan di Liga Top Eropa — Part 1: Kickoff & Rencana
series: Prediksi Survival Klub Debutan Kenapa Project Ini? Setiap musim, klub yang promosi ke liga top (Premier League, La Liga, dst.) menghadapi risi…
Markov Chain Monte Carlo: Theoretical Foundations
Adapted from an appendix of my MS thesis. Markov Chain Monte Carlo Almost as soon as computers were invented, they were used for simulation. Markov ch…
Why Is the Normal Distribution So Important in Machine Learning and Statistics?
If you've started learning machine learning or statistics, you've probably encountered the term normal distribution countless times. Whether you're re…
I tracked every trending AI repo's stars daily for 3 weeks. The growth is not where I expected
I run a small AI trends site, and three weeks ago I started doing something simple: every day, snapshot the star count of every repo that crosses my G…
From Raw Prices to Real Signals: Financial Metrics for a Data Pipeline (Daily Return, MA, RSI, MACD, Volatility)
In this article I will share my understanding and use of some financial metrics used in my Financial Dashboard project. You can see it in this link an…
A CSV sample that looks like the whole dataset is worse than no CSV at all
I've been building data2prompt for a few months now. It takes a data-heavy project (CSVs, SQL dumps, notebooks, Excel files) and turns it into a singl…
How ICD-10 Codes Map to an HCC / RAF Score (and Why the Same Code Set Yields Different Scores)
If you're building anything that touches Medicare Advantage risk adjustment, sooner or later you hit this question: "How do ICD-10 codes map to an HCC…
Bootstrapped Data Products — Here's What I Learned
I'm Heshan. I build data products. No VC, no team — just me, a lot of Playwright scripts, and PostgreSQL. Two years ago I couldn't build anything that…
The first article in the Panda Library Mastery series
Mastering Pandas — Part 1: Reading, Sorting & Displaying Data Hussein Mahdi Hussein Mahdi Hussein Mahdi Follow Feb 26 Mastering Pandas — Part 1: R…
Getting Started with Data Projects: My Honest Learning Journey
When I first dipped my toes into the world of data projects, I thought it would be all about numbers, charts, and maybe a bit of SQL. But what I’ve di…
Translate Chinese University Projects into US Data Engineering Bullets
Why Chinese University Projects Need a US Rewrite Recruiters at US companies scan resumes for 6-10 seconds. They expect bullets that prove you can do …
How to Build a Point-in-Time Fundamentals Database from SEC EDGAR (and When Not To)
If you backtest with today's fundamentals, you are cheating yourself. The Revenue figure you pull for Q4 2019 was probably restated in 2021, and the r…
How a JavaScript Pivot Table Can Handle 10 Million Rows in the Browser
Most JavaScript pivot table examples start with a few hundred JSON records. That is fine for a demo, but it does not answer the question teams eventua…
Modeling the Expected Value of a Sealed Card Box (and Where the Number Quietly Lies)
A friend messaged me a photo of a sealed booster box last month with one question: "worth it?" He'd already decided, really. The chase card in that se…
How to Get Canadian Charity Data by API (2026)
Canada has about 85,000 registered charities , and the Canada Revenue Agency (CRA) publishes the whole list as open data — legal names, mailing addres…
Why Most Students Learn AI the Wrong Way
A strange thing is happening in AI education. Students are completing course after course, collecting certificates, and consuming hours of content eve…
Exporting any Bluesky profile's followers with the open API
Every big social network locks audience data behind auth walls and anti-bot systems. Bluesky went the other way. The AT Protocol is open by design, so…
From My Machine to the Cloud: Connecting Power BI to SQL Databases; PostgreSQL (Local vs Aiven)
Introduction I used to think "connecting to a database" was one skill. Turns out it's two: connecting to a database chilling quietly on your own lapto…