Jerry A. Hausman

The work. The Hausman test, published in 1978, checks whether the shortcut model you want to use gives the same answer as the safe one you should. It has run in the background of nearly every applied paper since.

The case for. Half the profession has typed his name into a regression output. Method prizes happen: 2000, 2003, 2021.

The case against. Halbert White, named alongside him, died in 2012, and a diagnostic test on its own is a thinner citation than a theory.

The KmikeyM angle. The test asks whether your assumptions quietly bias the result. A governance experiment with one subject cannot run it, and knows it.