Difference between female and male usage [closed]

Just out of curiosity I have done some quick statistics.

I downloaded the following books from Project Gutenberg

Men writers

• Alice's Adventures in Wonderland by Lewis Carroll
• Adventures of Huckleberry Finn by Mark Twain
• Moby Dick, or, the whale by Herman Melville
• The Adventures of Sherlock Holmes by Sir Arthur Conan Doyle
• The Picture of Dorian Gray by Oscar Wilde
• Paradise Lost by John Milton
• The Works of Edgar Allan Poe — Volume 1 by Edgar Allan Poe
• War and Peace by graf Leo Tolstoy
• Dracula by Bram Stoker
• Treasure Island by Robert Louis Stevenson

Women writers

• Secret Adversary by Agatha Christie
• Jane Eyre by Charlotte Brontë
• Frankenstein by Mary Wollstonecraft Shelley
• Pride and Prejudice by Jane Austen
• Sarah Orne Jewett
• Ramona by Helen Hunt Jackson
• Home Influence by Grace Aguilar
• Middlemarch by George Eliot
• A Season at Harrogate by Mrs. Hofland
• Wuthering Heights by Emily Brontë

After removing the common Project Gutenberg header, I've read the files in R, split them into characters and let it count vowels and consonants.

I had a total of 8725700 characters for men and 11468186 for women

Here's a graph with the ratios consonants/vowels¹ calcolated per book (showing mean +/- standard deviation)

There is no statistical significance in the two groups (p=0.89, t-test)

EDIT

I played some more with the data and I got this bargraph of usage of the single letters.

Again, you can see no major differences between men and women writers

EDIT2: I repeated the analysis with 10 books per group. I would say that there is definitely no difference

¹ I considered a, e, i, o and u as vowels, the result does not grossly change including y.