Add training workflow, datasets, and runbook
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66 • The Intelligent Option Investor
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still fall slowly. Time decay is governed by the shape of the BSM cone and
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the degree to which an option’s range of exposure is contained within the
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BSM cone. The two basic rules to remember are:
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1. Time decay is slowest when more than three months are left
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before expiration and becomes faster the closer one moves toward
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expiration.
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2. Time decay is slowest for ITM options and becomes faster the
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closer to OTM the option is.
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Visually, we can understand the first rule—that time decay increases
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as the option nears expiration—by observing the following:
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Slope is shallow here...
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But steep here...
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The steepness of the slope of the curve at the two different points
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shows the relative speed of time decay. Because the slope is steeper the less
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time there is on the contract, time decay is faster at this point as well.
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Visually, we can understand the second rule—that OTM options lose
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value faster than ITM ones—by observing the following:
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Time BT ime A Time BT ime A
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GREEN
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GREEN
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ORANGE
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OTM option ITM option
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