S&P 500 - 1984

The following graph plots the year-to-date performance of the index for 1984 compared to the probability calculated by a random walk model.

Initial Value: 164.93 Hist. Volatility: 0.67% Annual Drift: 7% Final Value: 167.24 Percentile: 36%
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 1984 (what's this?).