NYSE AMEX Composite Index - 2001

The following graph plots the year-to-date performance of the index for 2001 compared to the probability calculated by a random walk model.

Initial Value: 897.75 Hist. Volatility: 1.04% Annual Drift: 7% Final Value: 847.61 Percentile: 30%
Click on the image for the high resolution version.

The high to date and low to date prices of the stock plotted against a random walk model for 2001 (what's this?).