The tick index compares the number of stocks that are rising to the number of stocks that are falling on the New York Stock Exchange.

Read about the role of an index number in economics and how index numbers can be applied to all kinds of data, such as inflation or productivity.

Index numbers An index or index number combines relative changes in various variables into one figure. Price and volume indices are important indicators in economic statistics. They give aggregated ...

Index number A way to standardize the price changes of goods that have much different prices. For example, a consumer price index might be represented by a shopping cart of goods. Suppose those ...

W. Erwin Diewert, Index Number Theory Using Differences Rather than Ratios, The American Journal of Economics and Sociology, Vol. 64, No. 1, Special Invited Issue: Celebrating Irving Fisher: The ...