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David Langer (Dave on Data)

David Langer (Dave on Data)

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Analytics/Excel educator; shares FP&A forecasting techniques (Python-in-Excel, ARIMA/ML), scenario modeling, and data storytelling for finance.

Recent Posts

More Analysis, Fewer Dashboards: Solve the Real Problem
Social•Feb 14, 2026

More Analysis, Fewer Dashboards: Solve the Real Problem

I've worked as a Sr. Director of BI and Analytics and I had to learn something the hard way. Despite what business stakeholders say, another dashboard is rarely the right answer to their needs. Why? Because what's behind the ask is a misconception about the actual need. They think another dashboard will help them get to the "why." And then they get frustrated because they can't get the answers they need. Stop the insanity. Organizations need more data analysis, not more dashboards.

By David Langer (Dave on Data)
Turn Excel Into a Text Mining Powerhouse
Social•Feb 14, 2026

Turn Excel Into a Text Mining Powerhouse

Each week I send out a free analytics tutorial to 39,009 professionals. This week is Part 3 in a series on mining free-form text data using Python in Excel. Think about this for a second. Production quality, reproducible text mining inside an Excel...

By David Langer (Dave on Data)
Business Professionals Need Data Analysis Skills, Not Analyst Titles
Social•Feb 11, 2026

Business Professionals Need Data Analysis Skills, Not Analyst Titles

I teach professionals data analysis. Not to be Data Analysts. Why? Because most analyses are conducted by business professionals, not IT. And with Copilot in Excel, that's only going to increase, not decrease.

By David Langer (Dave on Data)
Excel Pros Must Learn Python to Trust Copilot
Social•Feb 10, 2026

Excel Pros Must Learn Python to Trust Copilot

I've been doing analytics for 14+ years. And I'm a Microsoft Excel MVP. It's 2026 and top Excel users know better than making this mistake: Ignoring Python. Because Copilot in Excel uses Python to work it's magic with your data. Even if it doesn't tell...

By David Langer (Dave on Data)