For some data.table users, “dot-SD” is a bit of a mystery. But data.table creator Matt Dowle told me that it’s actually quite simple: Just think of it as a symbol representing “each group.” Let’s go ...

For the Microsoft Power BI report designer, importing Microsoft Excel data is a common task. Once in Power BI, you analyze and report on that data. Occasionally, you might need to export a Power BI ...

Here's a step-by-step guide to blending data tables from different tools to uncover valuable new insights using Python (or SQL). Sometimes we face questions that are hard to answer with the ...

Q. You explained Excel’s Scenario Manager in your November 2024 Tech Q&A article and Goal Seek in your December 2024 Tech Q&A article. Can you please explain the final What-If Analysis tool: Data ...

Charlene Rhinehart is a CPA , CFE, chair of an Illinois CPA Society committee, and has a degree in accounting and finance from DePaul University. Vikki Velasquez is a researcher and writer who has ...