Inverse and leveraged indices

main article: Alternative Indices

Inverse and Leveraged Index Methodologies

 * S&P 500 Inverse Daily Index
 * S&P 500 2x Inverse Daily Index
 * S&P 500 2x Leverage Daily Index
 * S&P U.S. Indices Methodology

Articles

 * Warning: Leveraged and Inverse ETFs Kill Portfolios Paul Justice, Morningstar, 1/22/09