rating vs valuation

rating

noun
  • An evaluation of status, especially of financial status. 

  • An enlisted seaman not a commissioned officer or warrant officer. 

  • A number, letter, or other mark that refers to the ability of something. 

  • A position on a scale. 

  • A quantitative measure of the audience of a television program. 

  • A seaman in a warship. 

valuation

noun
  • The process of estimating the value of a financial asset or liability. 

  • An assignment of truth values to propositional variables, with a corresponding assignment of truth values to all propositional formulas with those variables (obtained through the recursive application of truth-valued functions corresponding to the logical connectives making up those formulas). 

  • A measure of size or multiplicity. 

  • A map from the class of open sets of a topological space to the set of positive real numbers including infinity. 

  • A structure, and the corresponding assignment of a truth value to each sentence in the language for that structure. 

  • An estimation of something's worth. 

How often have the words rating and valuation occurred in a corpus of books? (source: Google Ngram Viewer )