
Yes, I did. And after further skimming this release, it was even worse than I thought!! I don't just mean garden variety insane, but seriously demented, probably evil, and definitely a threat to our national security. I mean, really, what kind of a diseased mind could produce the following:
Adjustment Factors for Credit Quality
In the pricing model, the adjustment factors for credit quality are added to the present value of the bond's cash flows as given by the forward rate and the discount function. Specifically, the adjustment factors are made up of two linear regression variables added to the present value with two respective regression coefficients that need to be estimated. These variables adjust the bond prices so that the discount function and the spot rates represent market-weighted average credit quality of the top three quality levels (AAA, AA, and A).
Specifically, some of the deviation between the predicted price for the bond (based on the cash flows and the discount function) and the actual price for the bond can be attributed to differences in credit quality and some of the deviation is an error factor. The model determines the portion of the deviation that is attributable to credit quality by determining the two adjustment factors that reflect the relative proportion of A-rated bonds within the data set and the relative proportion of AA-rated bonds within the subset of AA- and AAA-rated bonds. A high proportion of A-rated bonds results in a larger deviation in price for the higher quality bonds, which means that the discount function used to develop the yield curve is more closely aligned with a discount function for A-rated bonds than for the higher rated bonds. Similarly, a higher proportion of AA-rated bonds within the subset of AA- and AAA-rated bonds means that the discount function is more representative of the AA-rated universe than the AAA-rated bonds.
These adjustment factors allow the yield curve to be based on the proportion of bonds at the three quality levels in the market determined over the entire maturity spectrum (rather than on the proportion at each specific maturity point). This avoids potential distortions which could arise because of different proportions of bonds at the three quality levels at various maturity points.
Estimates for the parameters
These seven parameters, comprising five parameters in the cubic spline and the two adjustment coefficients on the bond-quality adjustment variables, are estimated from the bond price data. The estimation is done by nonlinear least squares, that is, the seven parameter estimates are chosen to minimize the sum of the squared differences between the actual bond prices and the prices given by the bond price model.
Before the estimation is carried out, the bond data are weighted. The weighting consists of two stages. In the first stage, equal weights are assigned to the commercial paper rates at the short end of the curve, and the par amounts outstanding of all the bonds are rescaled so that their sum equals the sum of the weights for commercial paper. Then, the squared price difference for each bond is multiplied by the bond's rescaled par amount outstanding, and the squared difference for each commercial paper rate is multiplied by the commercial paper weight. In the second stage, for bonds with duration greater than 1, the weighted squared price difference for each bond from the first stage is divided by duration.
I used to think all of us Red Sox fans were nuts (well, we are, but that's another story) but you EA's have elevated it to a whole different level. I'm rather glad to be an ordinary simpleton just now.