%0 Journal Article %A Stanley J. Kon %A Christine Y. Polek %T Time-Varying Empirical Duration and Slope Effects for Mortgage-Backed Securities %D 1998 %R 10.3905/jfi.1998.408242 %J The Journal of Fixed Income %P 7-28 %V 8 %N 2 %U https://jfi.pm-research.com/content/iijfixinc/8/2/7.full.pdf