Duration and Convexity

Hello all you guys, i have a problem with the duration combine with convexity formula to caculate the bond price change in percentage when yield fluctuated. In CFAI curriculum, the Formula said that we must time 1/2 (half) in the convexity when caculate the convexity effect, but in Kaplan Schweser it is not. You can look at the formular at page 107 Schweser note (2014, Fix income). Would you guys please explain me at this point? Your Support will be greatly appreciated.

I wrote an article on convexity in which I address this question: http://financialexamhelp123.com/convexity/.

It’s a recent change in the CFA curriculum, so Schweser may simply have failed to edit their notes. Use the formula in the CFA curriculum.

Dear S2000magician, thanks for your help.

My pleasure.