S&P 500 - 1967

The following graph plots the year-to-date performance of the index for 1967 compared to the probability calculated by a random walk model.

Initial Value: 80.33 Hist. Volatility: 1.09% Annual Drift: 7% Final Value: 96.47 Percentile: 75%
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 1967 (what's this?).