AmericanBSPut_Greeks

Purpose

Computes Delta, Gamma, Theta, Vega, and Rho for American put options using the Black, Scholes, and Merton method.

Format

{ d, g, t, v, rh } = AmericanBSPut_Greeks(S0, K, r, div, tau, sigma)
Parameters:
  • S0 (scalar) – current price.
  • K (Mx1 vector) – strike prices.
  • r (scalar) – risk free rate.
  • div (scalar) – continuous dividend yield.
  • tau (scalar) – elapsed time to exercise in annualized days of trading.
  • sigma (scalar) – volatility.
Returns:
  • d (Mx1 vector) – delta.
  • g (Mx1 vector) – gamma.
  • t (Mx1 vector) – theta.
  • v (Mx1 vector) – vega.
  • rh (Mx1 vector) – rho.

Global Input

\_fin_thetaType

scalar, if 1, one day look ahead, else, infinitesmal. Default = 0.

\_fin_epsilon

scalar, finite difference stepsize. Default = 1e-8.

Examples

S0 = 305;
K = 300;
r = .08;
sigma = .25;
tau = .33;

print AmericanBSPut_Greeks(S0, K, r, 0, tau, sigma);

produces:

 -0.35320196
0.0061105530
  -8.2280908
   66.227314
  -39.607080