S&P 500 - 1969

The following graph plots the year-to-date performance of the index for 1969 compared to the probability calculated by a random walk model.

Initial Value: 103.86 Hist. Volatility: 1.08% Annual Drift: 7% Final Value: 92.06 Percentile: 20%
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 1969 (what's this?).