What is S&P 500? The Standard and Poor's 500, or simply the S&P 500, is a stock market index tracking the stock performance of 500 leading companies listed on stock exchanges in the United States.It is one of the most commonly followed equity indices and includes approximately 80% of the total market capitalization of U.S. public companies. In better terms, it is like a report card for the United States Stock Market by showing how big, important companies are doing overall in finance. It only tracks the top 500 largest publicly traded Companies in the USA. (Source: Wikipedia 2025)

Evaluating cloud seeding data. Vivian Strange - GEOG 5680

The Kolmogorov-Smirnov (K-S) test is a non-parametric method used to compare a sample's distribution to a fully specified continuous theoretical distribution.