duplicity vs skewness

duplicity

noun
  • Intentional deceptiveness; double-dealing. 

skewness

noun
  • The property of being skew. 

  • A measure of the asymmetry of the probability distribution of a real-valued random variable; is the third standardized moment, defined as scriptstyle 𝛾₁=(𝜇₃)/(𝜎³),! where 𝜇₃ is the third moment about the mean and 𝜎 is the standard deviation. 

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