Dear all,

  I wrote the following code to calculate the density functions for two data
sets, respectively.

  den_str <-density(str_data$Similarity);
  den_non_str <-density(nonstr_data$Similarity);

  However, I would like to knowing the difference between den_str and
den_non_str, that is, the difference between the region under the curve of
the den_str and the region under the curve of the den_non_str.

 How to do?

 Thank you for help.

Jia-Ming

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