Page Authority (PA) is a score developed by Moz and is very similar to Domain Authority score except it is a predictor for how well a specific page will rank not your entire website. PA score ranges from 1 to 100, the higher the score, the more likely your page is to rank well.
PA score is calculated using multiple factors. It uses machine learning to identify the algorithm that best corresponds with rankings across 1000s of search results, then determines a PA score using that specific calculation.
PA is only an indicating value and is not used by Google.
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