**Bayesianism via Likelihood Theory**

**Bayesianism via Likelihood Theory**

### Hartry Field (NYU)

**Abstract: **Bayesianism is best introduced not by the usual arguments for it but by its applications. And a good way to focus on its applications is by comparison to the likelihood ratio approach to the confirmation of statistical hypotheses. The latter turns out to be a much more general theory than is usually appreciated, but does have limitations that a recognizably Bayesian approach overcomes. An advantage of approaching Bayesianism via likelihood theory is that doing so leads naturally to a questioning of some harmful idealizations built into crude forms of Bayesianism.