Method and system for multi-period performance attribution

Details Method and system for multi-period performance attribution Method and system for multi-period performance attribution

2007-07-24

2007-07-24

Nguyen, Nga (Department: 3692)

Data processing: financial, business practice, management, or co

Automated electrical financial or business practice or...

Finance

C705S035000, C705S037000, C705S038000, C705S039000, C705S001100

Reexamination Certificate

active

09613855

ABSTRACT:
A method for arithmetic and geometric performance attribution which accurately links single-period attribution effects over multiple periods. The arithmetic attribution method optimally distributes the residual to yield a minimum-distortion residual-free arithmetic attribution system. The geometric attribution method defines the attribution effects in terms of ratios. The arithmetic method determines portfolio performance over multiple time periods as a sum of terms of form (Rt−Rt)(A+αt), where the coefficients αtare defined asαt=[R-R_-A⁢∑k=1T⁢(Rk-R_k)∑k=1T⁢(Rk-R_k)2]⁢(Rt-R_t).The value of A isA=1T⁡[(R-R_)(1+R)1/T-(1+R_)1/T],where R≠R, or, for the special case of R=R, A=(1+R)(T−1)/T, where T is the number of time periods. In all embodiments, the inventive coefficient (A+αt) have smaller (typically much smaller) standard deviation than conventional logarithmic coefficients, which reduces variation in the weights assigned to each time period relative to the other time periods in the attribution calculation. The geometric method determines portfolio relative performance over multiple time periods as1+R1+R_=∏t=1T⁢∏i=1N⁢(1+IitG,Vestek)⁢(1+SitG,Vestek),where1+IitG,Vestek=(1+wit⁢rit1+wit⁢r_it)⁢Γtis the geometric issue selection and1+SitG,Vestek=(1+wit⁢r_it1+w_it⁢r_it)⁢(1+w_it⁢R_t1+wit⁢R_t)⁢Γtis the geometric sector selection, withΓt=[(1+Rt1+R_t)⁢∏j=1N⁢(1+w_jt⁢r_jt)⁢(1+wjt⁢R_t)(1+wjt⁢rjt)⁢(1+w_jt⁢R_t)]12⁢⁢N.The attribution effects employed in the invention geometric attribution method have more natural form than the conventional counterparts, and allow geometric attribution to be performed more accurately. Other aspects of the invention are a computer system programmed to perform any embodiment of the inventive method, and a computer readable medium which stores code for implementing any embodiment of the inventive method.

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