Gunning Fog Index = [(number of words / number of sentences) + "difficult
words"] x 0.4
Number of words and number of sentences is easy.
Number of 'difficult' words means 'words of three or more syllables that are
not (a) proper names, (b) combinations of easy words, or (c) made three
syllables by suffixes such as -ed, -es, or -ing' which is obviously a lot
harder to work out, although you
estimate it by counting the number of words of more than 8(?) characters
that do not end in -ed, -es, or -ing, and which are not capitalised
mid-sentence.
Or you could hunt around for an earlier version of Word (pre-W97?), which
had the calculation built in.
