# Theta

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Related to Theta: Theta waves

## Theta

The ratio of the change in an option price to the decrease in time to expiration. Also called time decay.

## Theta

The decline in value of an option contract over the passage of time. Assuming all other factors (such as the price of the underlying security) remain constant, the price of the option will decline as the expiration date nears because it becomes less likely that the option will be in-the-money or out-of-the-money at expiration. Theta is an attempt to quantify this fact. It is important to note that because other factors do not always remain constant, the price of the option does not always decline according to the theta.

## theta

The sensitivity of an option's market value relative to a change in the time to expiration. Theta is a measure of time decay and tends to grow larger as an option approaches expiration.
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References in periodicals archive ?
In the controls, the total frontal theta power during music listening increased significantly in the left hemisphere (F (1, 15) = 5.011; p = 0.041), but the difference in the right hemisphere was not significant (F (1, 15) = 0.073; p = 0.790).
The RICOH THETA S will go on sale at a base price of Rs.39995 from the month of December 2015.
In section 3 we prove by direct application of mathematical induction that they satisfy Ramanujan's description of mock theta functions.
In two additional papers, they use their theory to prove longstanding conjectures about properties of the mock theta functions.
"We are thrilled to again partner with Phi Delta Theta on this great event.
Gan, "B-convergence of split-step one-leg theta methods for stochastic differential equations," Journal of Applied Mathematics and Computing, vol.
Employing the Jacobi triple product identity, we can derive the infinite product expressions for theta function.
In each of the transactions, the CB Richard Ellis brokerage team representing Overlook's owner, Theta Holding Company, L.P., consisted of Senior Vice President Steven M.
[e.sub.rad](t) = i(t - r/c)u sin(theta)/4[pi][[epsilon].sub.o][c.sup.2]r 1/[1 - u cos[theta]/c] [a.sub.[theta]] (3)
Arockiarani, Theta Compactness in Grill Topological spaces, submitted.

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