Adjusting Portfolio Duration Target

CFA Level III Fixed Income
#1

Hi, did the CFA remove the portfolio duration adjustment calculation when they updated the FI section a few years ago? Was it replaced with the BPVHR formula? I am confused on when or if not at all to use BPHR formula and the formula below? Thx.

of contracts= (yield beta) * ((Duration Target - Duration Portfolio)/Duration of Futures)) * ((Port Value/Futures Price*Multiplier))

#2

They took out the Yield Beta. Now it is just:

N_f = \frac{ModDur_T - ModDur_S}{ModDur_{CTD}} \times \frac{S}{CTD ~Price} \times Conversion ~Factor