The population base rate is the base rate or prevalance in the overall population. Of course this overall population may vary with context: for example in some cases we might be considering the general public, in some cases expert users only. The population base rate may also differ from the sample base rate used in training or sampled for study and the presentation base rate for the final context of use.
Used in Chap. 14: page 180
Also used in hcistats2e: Chap. 7: page 80
Used in glossary entries: base rate, presentation base rate, sample base rate