> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://biasinvestors.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Index

(1) A statistical benchmark expressed in terms of percentages of a base year or years. For instance, the Federal Reserve Board’s index of industrial production is based on 1967 as 100. An index is not an average.
(2) A statistical measure of a group of stocks such as the S&P 500. Indices can be broad based (which cover a wide range of companies and mirror the market as a whole) or narrow based (which consist of securities from a particular industry).