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+HV-IV Divergence
+An HV-IV divergence occurs when HV declines and IV rises or vice versa.
+The classic example is often observed before a company’s quarterly
+earnings announcement, especially when there is lack of consensus among
+analysts’ estimates. This scenario often causes HV to remain constant or
+decline while IV rises. The reason? When there is a great deal of
+uncertainty as to what the quarterly earnings will be, investors are reluctant
+to buy or sell the stock until the number is released. When this happens, the
+stock price movement (volatility) consolidates, causing the calculated HV
+to decline. IV, however, can rise as traders scramble to buy up options—
+bidding up their prices. When the news is out, the feared (or hoped for)
+move in the stock takes place (or doesn’t), and HV and IV tend to converge
+again.