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"Some are born great,

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some achieve greatness,

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and others have greatness thrust
upon them", quoth William Shakespeare.

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Or did he?

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Some people question whether Shakespeare
really wrote the works that bear his name,

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or whether he even existed at all.

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They speculate that Shakespeare
was a pseudonym for another writer,

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or a group of writers.

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Proposed candidates 
for the real Shakespeare

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include other famous playwrights, 
politicians and even some prominent women.

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Could it be true that the greatest writer
in the English language

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was as fictional as his plays?

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Most Shakespeare scholars 
dismiss these theories

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based on historical 
and biographical evidence.

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But there is another way to test
whether Shakespeare's famous lines

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were actually written by someone else.

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Linguistics, the study of language,

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can tell us a great deal about the way
we speak and write

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by examining syntax, grammar, 
semantics and vocabulary.

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And in the late 1800s,

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a Polish philosopher 
named Wincenty Lutosławski

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formalized a method known as stylometry,

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applying this knowledge to investigate 
questions of literary authorship.

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So how does stylometry work?

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The idea is that each writer's style
has certain characteristics

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that remain fairly uniform 
among individual works.

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Examples of characteristics include
average sentence length,

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the arrangement of words,

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and even the number of occurrences
of a particular word.

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Let's look at use of the word thee
and visualize it as a dimension, or axis.

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Each of Shakespeare's works
can be placed on that axis,

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like a data point, based on the number
of occurrences of that word.

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In statistics, the tightness 
of these points

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gives us what is known as the variance,
an expected range for our data.

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But, this is only a single characteristic
in a very high-dimensional space.

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With a clustering tool
called Principal Component Analysis,

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we can reduce the multidimensional space
into simple principal components

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that collectively measure the variance
in Shakespeare's works.

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We can then test the works
of our candidates

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against those principal components.

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For example,

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if enough works of Francis Bacon
fall within the Shakespearean variance,

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that would be pretty strong evidence

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that Francis Bacon and Shakespeare
are actually the same person.

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What did the results show?

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Well, the stylometrists who carried 
this out have concluded

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that Shakespeare is none other 
than Shakespeare.

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The Bard is the Bard.

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The pretender's works just don't match up
with Shakespeare's signature style.

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However, our intrepid 
statisticians did find

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some compelling evidence 
of collaborations.

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For instance, one recent study concluded

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that Shakespeare worked with playwright
Christopher Marlowe on "Henry VI,"

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parts one and two.

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Shakespeare's identity is only one of 
the many problems stylometry can resolve.

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It can help us determine
when a work was written,

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whether an ancient text is a forgery,

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whether a student has committed plagiarism,

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or if that email you just received 
is of a high priority or spam.

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And does the timeless poetry 
of Shakespeare's lines

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just boil down to numbers and statistics?

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Not quite.

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Stylometric analysis may reveal what makes
Shakespeare's works structurally distinct,

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but it cannot capture the beauty of
the sentiments and emotions they express,

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or why they affect us the way they do.

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At least, not yet.