FrIm    = Frequency in imaginative writing
Ra      = Range (0-19 for imaginative writing; 0-71 for informative writing)
DiIm    = Dispersion (Juilland's D) in imaginative writing
LL      = Log Likelihood (measure of distinctiveness)
FrIn    = Frequency in informative writing
DiIn    = Dispersion (Juilland's D) in informative writing