difference between domain authority vs Page authority

[alex.thomson]

Domain authority must not be confused with page authority that is a completely different metric. While domain authority gives you the ranking of the site as a whole, page authority is the score of that single page in question.
Domain authority is constant across the whole site, but page authority changes across sub-domains of the same root domain.

[manishaverma]

The difference between domain authority vs Page authority .Domain Authority is based on the strength of the whole domain while Page Authority is based on the strength of the individual page and it is a Domain authority is a ranking factor in Google which measures a website/domain's authority by the number of credible sites linking back to it.

[gurujeet]

Domain authority is a measure of the power of a domain name in one or many search engine ranking factors. Domain authority is based on three factors: Age, Popularity, and Size.

Page Authority is a score (on a 100-point scale) developed by Moz that predicts how well a specific page will rank on search engines. It is based on data from the Mozscape web index and includes link counts, MozRank, MozTrust, and dozens of other factors. It uses a machine learning model to predictively find an algorithm that best correlates with rankings across the thousands of search results that we predict against.

[annarichart]

The difference between DA and PA is that whereas Domain Authority measures the predictive ranking strength of entire domains or subdomains, Page Authority measures the strength of individual page.