This R script can be copied and pasted into R.  In R, the script will read an input file or multiple input files and calculate the amount of jargon present in the file(s).  It will also create a list of words that may be jargon, so the writer can consider those words when writing for a general audience.  An optional zip file contains pre-assembled corpora, as well as two example files. 

Below is a graph of the documents we have used to benchmark j values.  Also shown are two word clouds, and it can be seen that the majority of words spoken in TED talks are quite different than the majority of words in NASA E-books

Benchmark jargon values

NASA E book word cloud

TED talk word cloud