The interest rate risk of a bond price $P$ is measured by its Duration: $$D=-\frac{\frac{dP}{P}}{dr}$$

However, the explicit formula for the Duration given a function $P$ is different if $r$ is expressed in continuous or discrete compounding.

If $r$ is calculated in discrete compounding, the modified Duration should be used: $$D^{Mod}=\frac{D}{1+r}$$

Is there also an expression for the relationship of Convexity under discrete vs. continuous compounding? The convexity of a bond is defined as the second derivative of the bond price: $$C=\frac{\frac{d^2P}{P}}{dr^2}$$

  • 1
    $\begingroup$ Modified Convexity = $C^{Mod} = Convexity / (1+r)^2 $ $\endgroup$
    – Alex C
    Jan 18 '16 at 18:22
  • 2
    $\begingroup$ @AlexC Can you show the proof for a bond with coupon $c$? $\endgroup$
    – emcor
    Jan 18 '16 at 18:35

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