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发表于 2011-9-29 04:42 PM
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wyemlyy 发表于 2011-9-29 16:57 
vix 40 ---> spy 3-3.5 range, how to calculate that out?
VIX is the expected movement in the S&P 500 index over the next 30-day period, which is then annualized.
40 / Sqrt(12) = 11.547
VIX equal to 40 means SPX has a expect movement of 11.547% over the next 30-day period.
Assuming 20 trading day each month with spy of 117, the expected daily movement of spy would be
117*0.11547 / Sqrt(20) = 3.02
Therefore the daily expected movement of spy would be $3.02. |
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