Morningstar Quantitative Ratings for Stocks are generated using an algorithm that compares companies that are not under analyst coverage to peer companies that do receive analyst-driven ratings.

Troy Segal is an editor and writer. She has 20+ years of experience covering personal finance, wealth management, and business news. Toby Walters is a financial writer, investor, and lifelong learner.

Michael Rosenston is a fact-checker and researcher with expertise in business, finance, and insurance. Julie Bang / Investopedia A Z-test evaluates the significance of a sample mean's difference from ...