Seventy-eight percent of the stock screens AAII tracks posted gains during 2025, with an average gain of 14.7%.

Discover how base periods serve as benchmarks to analyze variable changes over time. Learn their role in economics and finance, and see practical examples.

Discover what ex-post means in finance, how it is calculated, and how it differs from ex-ante. Use historical data to better ...

When you’re filling in a Microsoft Excel spreadsheet, the idea of an international competition testing those skills is probably far from your mind. Yet Excel ha ...

Abstract: The effective earth radius can transform the curved ray path into a straight line, and the modified refractive index can transform the spherical ground into a plane. Using them can simplify ...