What is the test for providing an adequate factual basis for a restitution claim?

This is not a Herculean task. If the victim had sought compensation directly from appellant rather than through an insurer, she would be required "to provide an adequate factual basis for the [restitution] claim." (People v. Giordano (2007) 42 Cal.4th 644, 664.) Moreover, "a trial court has broad discretion to choose a method for calculating the amount of restitution" and need only "employ a method that is rationally designed to determine the surviving victim's economic loss." (Id. at pp. 663-664.)