If you’ve ever built a running total in Excel, you’ve probably written something like {=SUM(A$1:A2)} and dragged it down the column again and again. It’s a simple enough approach—until your dataset ...

Windows 10 or later: This project uses modern Windows networking and threading APIs (IO Completion Ports, SetThreadGroupAffinity, and related Winsock features) that require Windows 10+ for full ...

Learn the difference between Excel COUNT and COUNTA, plus TEXTBEFORE and TEXTAFTER tricks, so you clean text and totals with ...

Learn how GROUPBY passes both subset and full arrays into LAMBDA in Excel, letting you compute percent shares fast and explain results clearly.

Learn to simulate stock prices with Excel and gain predictive power over market trends. Our step-by-step guide enhances your ...

You'd think that PivotTables are the easiest and least stressful way to summarize data in Excel. For a long time, I believed that, too. That changed once I got comfortable enough using GROUPBY and ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Gordon Scott has been an active investor and ...

Abstract: In this paper, a cumulative-sum-based fault detection algorithm is proposed for the power system relaying application. Literature suggests the successful application of this method to ...

Abstract: Online change detection involves monitoring a stream of data for changes in the statistical properties of incoming observations. A good change detector will detect any changes shortly after ...