The Relationship of the SPX and the VIX® Index
The chart below shows the daily closing prices for the S&P 500 and VIX during the third quarter of 2012. The blue line and left scale represent the S&P 500 while the red line and right scale represent VIX. This chart is a typical example of how the S&P 500 and VIX move relative to each other on a daily basis.
The table below examines price behavior from January 1, 2000 to September 28, 2012. During this time period the S&P 500 closed higher on 1692 trading days, and of those days, VIX closed lower on just over 82% of the time. Also, during this period, the SPX closed lower on 1514 trading days, and of those days, VIX closed higher over 78% of the time. Altogether, during the period covered in the table, VIX moved in the opposite direction of the S&P 500 about 80% of the time.