NYSE AMEX Composite Index - 2006

The following graph plots the year-to-date performance of the index for 2006 compared to the probability calculated by a random walk model.

Initial Value: 1759.08 Hist. Volatility: 0.74% Annual Drift: 7% Final Value: 2056.43 Percentile: 78%
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 2006 (what's this?).