Article Topics: 

Background

The ability to run whole loan cashflows is a core component of the dv01 app and can be launched by clicking the "Cashflows" tab. Securitization cashflows are also available.


Whole Loan Cashflow Setup 

Initially, the page displays a single scenario, but additional scenarios can be added and scenarios can be copied. Each scenario allows for Prepay, Default, DQ monthly curves, Severity percentage, and Lag months. The Prepay, Delinquency, and Default inputs accept curves specified in our Curve Notation for specifying time-varying values. You also can name and save scenario/scenario sets for later re-use. Whole loan pools also feature the ability to define P&I and/or UPB fee percentages.


Creating Cohorts

Detailed below are two methods to cohort loans/create replines. Collateral can be grouped by any loan attribute and different performance assumptions can be assigned to each. 

 

Method One: Auto-Cohorting via Drop-down Menu  

A field can be selected from the Cohort By drop-down menu to quickly group the collateral by that characteristic (e.g. Original Term, FICO, Vintage, etc.), allowing for performance assumptions specific to each group. 


If an assumption for a cohort is not defined, it will inherit the top level value for that metric. 




Method Two: Custom Cohorting   

You can create a "custom cohort" using straightforward syntax and functions. Some tips on the syntax for these cohorts include but are not limited to:

1) Select an attribute by typing a bracket, which will display suggested attributes to choose from

2) To select multiple attributes within a cohort, use the && symbol

3) Use the function Between if you are looking to implement a range for an attribute (FICO, Term, Balance, etc.). These require parenthesis around the inputs

4) Any enum values need quotation marks around, while numbers do not need them

5) Percentages need to be in decimal format with a leading zero (e.g. 0.75 for 75%)

6) Additional formulas and logic can be seen in our Formula Guide

Hierarchically, custom cohorts come first. If a loan falls into the parameters defined by a custom cohort, then it cannot also be a part of a cohort that is lower down in the hierarchy. However, the base cohort, which remains fixed as the top row on the cashflow curve input table, is hierarchically at the bottom of all other rules and contains all loans that do not fit into any of the defined cohorts. 


Cohort Summary Visualization

Upon selecting a metric, loans are grouped into the respective cohort and the % Bal column populates to display the distribution by outstanding loan balance. There is also a Cohort Distribution bar providing a visual representation of the collateral distribution. Hovering the cursor on this bar will pop-up loan count, % of balance, and total notional balance for that group.


Creating Additional Scenarios

Additional scenarios can be created by (A) clicking the "Create new scenario" button or (B) copying an existing scenario .


Often times, option B is used in conjunction with scales curves keep the shape of a performance metric curve, but parallel shifting it up or down with a multiple.


Once inputs/scenarios are complete, click “Run cashflows". 


Cashflow Results & Valuation

The cashflow results display below the inputs and include: Collateral Cashflow Summary, Cum Prepay & Cum Net Loss charts, and Collateral Cashflows table. The cumulative charts display the already realized historical values as well as the projected values. 

The dv01 cashflow engine provides instant pricing recalculation in the output table by updating the Yield, Price, or Z Spread to deviate from the 100.00 default value. 


To modify the performance assumptions and re-run the scenarios, scroll up to the scenario set-up section, make changes, and click the purple "Run cashflows" button again.  


You can download a comprehensive waterfall cashflow report to Excel by clicking the 'Excel' link in the Collateral Cashflows section. 


Matrix Analysis

In addition to the Cashflow Results view, a Matrix Analysis view is another option where variable steps display on each wing of an anchored yield/price/market value/z-spread value. By default, it displays a +/- 200bps on yield, but 

the valuation parameter and the step size can be modified, as well as the center value.