Lately, I have had to explain what Babcock duration is. Further to saying it’s an alternative gauge of duration to Macaulay it simply is a weighted average of two factors :
- (maturity) and
The outright formula , the weighted average, is:
There’s a zero coupon with n years of maturity and a par-bond duration.
 Babcock, G., (1985), Duration as a Weighted Average of Two Factors, (March-April 1985) Financial Analyst Journal.
 Benninga, Simon, (2001), Financial Modeling, MIT Press.