S&P 500 - 1960

The following graph plots the year-to-date performance of the index for 1960 compared to the probability calculated by a random walk model.

Initial Value: 59.89 Hist. Volatility: 0.49% Annual Drift: 7% Final Value: 58.11 Percentile: 19%
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 1960 (what's this?).