S&P 500 - 1964

The following graph plots the year-to-date performance of the index for 1964 compared to the probability calculated by a random walk model.

Initial Value: 75.02 Hist. Volatility: 0.77% Annual Drift: 7% Final Value: 84.75 Percentile: 67%
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 1964 (what's this?).