At that point, the engineer was prepared to formally document eligibility for FHWA ER reimbursement on a DDIR
." One problem faced by the FHWA transportation engineers was where to draw the line in identifying each incidence of damage.
By disposing both time series of dDIR and dSIR we then try to relate them to their possible sources, getting further insights about pricing of Total-IR.
[partial derivative]DIR/[partial derivative]t [congruent to] [DIR.sub.t] - [DIR.sub.t-1] = dDIR (23)
[partial derivative]DIR/[partial derivative]t [congruent to] [dTIR.sub.t] - [dSIR.sub.t] = dDIR (24)
for the Dow Jones Eurostoxx 50) to measure proxies of IR at total level (dTIR) and also to split the systematic (dSIR) and the idiosyncratic (dDIR) components for the main industries-index composing the market-index.
dDIR = [dTIR.sub.t] - [dSIR.sub.t] [congruent to] [partial derivative]DIR/[partial derivative]t 1<t<4760 (24*)
For the Euro Stoxx index any value of SIR equals that of TIR, so that no DIR and no dDIR are computed.