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Data Analysis Journal

Data Analysis Journal

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User Segmentation and Power User Analysis in SQL
What are user segmentation techniques? How to locate your Power users? How to do user segmentation analysis in SQL?
 • Olga Berezovsky
Goodbye 2025 🎄 - Issue 297
A recap of 2025, confetti, gratitude, and what’s coming next!
 • Olga Berezovsky
Refresher on Metrics and KPIs - Issue 296
An evergreen guide to the metrics you’ll use for experimentation, analysis, modeling, and forecasting.
 • Olga Berezovsky
Refresher on Visualizations - Issue 295
Charts, dashboards, and storytelling basics - what actually matters when showing data.
 • Olga Berezovsky
Refresher on Experimentation - Issue 294
A consolidated guide to statistics, tools, best practices, and advanced experimentation
 • Olga Berezovsky
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My Consulting Journey: $0 to $685K in 6 months - Issue 232
 • Olga Berezovsky
10 Must-Know Concepts Every Analyst Should Know - Issue 290
 • Olga Berezovsky
Refresher on Retention - Issue 236
 • Olga Berezovsky
How to Create Decks That Don’t Suck - Issue 245
 • Olga Berezovsky
November Recap: Before You Trust That Lift
Your monthly recap of the latest trends, market shifts, and updates in data science and analytics
 • Olga Berezovsky
Churn: Why Most Teams Get It Wrong - Issue 292
How to build accurate churn reporting for your product, plans, and revenue model.
 • Olga Berezovsky
Structuring Data & Analytics Teams for Real Impact - Issue 291
How org structure shapes analytics insight, governance, and the quality of every decision.
 • Olga Berezovsky
10 Must-Know Concepts Every Analyst Should Know - Issue 290
From academia to industry - the core analytical principles we rely on every day.
 • Olga Berezovsky
October Recap: A Reality Check for Analytics
Your monthly recap of the latest trends, market shifts, and updates in data science and analytics
 • Olga Berezovsky
10 Experiments Every Data Team Should Run - Issue 288
Top must-try experiments every data scientist should know - lessons from StatSig Summit.
 • Olga Berezovsky
Reinventing How Analysts Work | Barry McCardel
How AI is reshaping how teams explore and communicate with data.
 • Olga Berezovsky and barry
How Notion Scaled Experimentation - Issue 286
How the team grew and scaled A/B testing without losing rigor - lessons from StatSig Summit.
 • Olga Berezovsky
When Simple Becomes Tricky: Should Discounts Be Included in MRR? - Issue 285
So many ways to screw up your reporting.
 • Olga Berezovsky
Data Analysis Journal
Data Analysis Journal
Where product, data science, and analytics intersect.
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SeattleDataGuy’s Newsletter
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Checklists
A/B Test Checklist
A short guide to product experimentation steps and must-know terminology.
SQL Date-Time Cheatsheet
A short guide to steps, solution, and must-know terminology
Python Pandas DateTime Reference Guide
A short guide to solutions and tips for handling DateTime cases in Python Pandas
Subscription Growth Metrics Checklist
A short guide to steps and must-know terminology
Tutorials
A Selection Of SQL Tutorials
A roundup of free SQL tutorials and articles to either get started with or to keep your querying skills strong.
A Selection Of Python Tutorials for Analysts
A roundup of my favorite tutorials for data analysts to either get started with or upkeep existing Python skills

Data Analysis Journal

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