Understand and code the R² metric (goodness of fit) in C++. A must-know concept for evaluating regression models.

Microsoft Excel turns 40 today, and the company has outlined plans for future updates set to transform how we work with data.

Have you ever opened an Excel file and felt a pang of unease? Rows upon rows of data, cryptic formulas sprawled across cells, and a tangle of manual formatting that seems one misstep away from chaos.

Since their introduction in 1993, PivotTables have remained one of Excel’s most powerful tools for summarizing and analyzing large datasets. With just a few clicks, you can transform raw, unstructured ...