Waterfall Forensics.

Tie-out heatmap

Wells Fargo Mortgage Backed Securities 2006-10

Every comparison the backtest ever made, on one screen: one column per distribution date, one row per class, colored by the worst absolute delta across interest, principal, and ending balance. The near-uniform field is the point. The few cells that broke a dollar are listed below, worst first.

5

periods replayed

94.6%

of 465 points within one dollar

25

points off by more than a dollar

A-1A-2A-3A-4A-5A-7A-8A-9A-10A-11A-12A-13A-14A-16A-17A-18A-19A-20A-21A-22A-23A-25A-POA-RB-1B-2B-3B-4B-5B-6A-6A-15A-24
2006
exact to the centwithin a pennywithin a dollarover a dollarno comparisonhover any cell for its worst delta

The exception queue

25 of 465 comparisons sit more than a dollar from the trustee's figure. This is the entire list. Of the rest, 345 matched to the exact cent and 28 differed by cents, rounding-sized and never compounding.

DateClassFigureComputedReportedΔ
2006-08-25A-7interest-227.92790,397.08790625.00
2006-08-25A-6interest824,990.0934,365.09790625.00
2006-09-25A-6interest822,783.0534,274.44788508.61
2006-09-25A-7interest-196.46788,312.14788508.60
2006-10-25A-7interest-216.61785,948.17786164.78
2006-10-25A-6interest820,336.4434,171.66786164.78
2006-11-27A-7interest-247.95783,227.29783475.24
2006-11-27A-6interest817,528.6034,053.36783475.24
2006-12-26A-7interest-960.94779,479.70780440.64
2006-12-26A-6interest814,331.0633,890.42780440.64
2006-08-25A-8interest286,865.94382,524.6995658.76
2006-09-25A-8interest286,447.08381,961.1795514.09
2006-10-25A-8interest286,001.02381,369.7395368.71
2006-11-27A-8interest285,547.26380,769.8695222.60
2006-12-26A-8interest284,759.03379,834.8095075.77
2006-08-25A-16interest61,494.910.0061494.91
2006-09-25A-16interest61,401.920.0061401.92
2006-10-25A-16interest61,308.460.0061308.46
2006-11-27A-16interest61,214.530.0061214.53
2006-12-26A-16interest61,120.130.0061120.13
2006-09-25A-21interest74,939.1579,210.244271.09
2006-08-25A-21interest74,978.3878,556.503578.12
2006-10-25A-21interest74,891.8578,262.893371.04
2006-11-27A-21interest74,840.3078,115.573275.27
2006-12-26A-21interest74,720.2277,962.053241.83

state rolls forward on computed values only — reported figures are never fed back in, so an engine error would compound rather than hide