PT - JOURNAL ARTICLE AU - Reinhold P. Lamb AU - Katheryn Northington TI - The Root of Reported Betas AID - 10.3905/joi.2001.319472 DP - 2001 Aug 31 TA - The Journal of Investing PG - 50--53 VI - 10 IP - 3 4099 - https://pm-research.com/content/10/3/50.short 4100 - https://pm-research.com/content/10/3/50.full AB - While research questions the usefulness of a stock's beta, its widespread availability implies continued use. Whether in a portfolio context or in a capital budgeting scenario, beta and its inputs should be clearly understood in order to enable a more accurate decision. This article provides investors a guide to how beta is calculated on 22 of the most popular websites and resources. The discussion connects research findings about beta's inputs to the data available.