What is the test for determining damages in a personal injury case?

This sparse analysis by the district court provides little on which we may base our review, and thus fails as a matter of law. See Arpin v. United States, 521 F.3d 769, 776 (7th Cir. 2008) (noting that when a district court determines the amount of damages following a bench trial, "the judge must indicate the reasoning process that connects the evidence to the conclusion" (internal quotation marks omitted)).