Rockport VAL: compare a Shock with a consistent base case

YOU ASK

My portfolio value moved after a Shock. How do I check that the comparison is fair?

The short answer

Hold the comparison scope constant and record every Shock assignment. A change in property selection, version, scenario or period can change the result independently of the Shock you intended to test.

Work through the checks

Record the base portfolio members and which rows are In Use.
Record each property’s Version and Scenario, plus the analysis dates and report being compared.
Record the portfolio Shock and inspect Override Shock? on every included property. A portfolio-level selection alone is not a complete description of the test.
Run the intended comparison with those other choices held constant. Review property-level changes before relying on the portfolio total.
Keep the comparison settings with the result so another reviewer can reproduce the same scope.

Make the check concrete
Original comparison log	Base	Downside
Included properties	Harbour + Park	Harbour + Park
Version / scenario / period	Same recorded choices	Unchanged
Intended adjustment	No applied adjustment	Named cap-rate Shock
Property overrides	Recorded for both rows	Checked against intended coverage

Invented audit log. A consistent setup is necessary for interpretation; it does not establish the quality of the underlying valuation assumptions.

THE EASY MISTAKE

If the property set changed, the difference is not a clean measure of the Shock’s effect.

Start with the detail that changes the answer.

Did the included properties, version, scenario or period change between the two reports?

Bring your software version and a screenshot with confidential details removed. Choose the Rockport VAL Companion and ask in your own language.

Three free questions total across modules, including follow-ups. No card required. Continue for US$49/month or US$490/year per module. Courses are separate and in development.