Stylometry is the application of the study of linguistic style , but it has been successfully applied to music  and to fine-art paintings  as well. 
Stylometry is often used to attribute authorship to anonymous or disputed documents. It has more legal and practical applications, ranging from the question of the authorship of Shakespeare’s works to forensic linguistics .
Stylometry grew out of earlier techniques of analyzing texts for authenticity, author identity, and other questions.
Renaissance drama. The major practice of the discipline received major impetus from the study of authorship problems. Researchers and readers observed that some playwrights of the era had distinctive patterns of language preferences, and attempted to use those patterns. Early efforts Were not always successful: in 1901, one researcher Attempted to use John Fletcher’s preference for ’em, “the contractional form of” them, “as a marker to Distinguish entre Fletcher and Philip Massinger In Their collaborations-but he mistakenly employed An edition of Massinger’s works in which the editor had expanded all instances of “’em” to “them”. 
The basics of stylometry were set out by Polish philosopher Wincenty Lutosławski in Principles of Stylometry (1890). Lutosławski used this method to build a chronology of Plato’s Dialogues.
The development of computers and their capabilities for analyzing large quantities of data. The great capacity of computers for data analysis, however, did not guarantee quality output. In the early 1960s, Rev. AQ Morton produced a computer analysis of the fourteen Epistles of the New Testament attributed to St. Paul. A check of his method, applied to the works of James Joyce , gave the result that Ulysses , Joyce’s multi-perspective, multi-style masterpiece, was written by five separate individuals; Joyce’s first novel, A Portrait of the Artist as a Young Man . 
In time, however, and with practice, researchers and researchers have refined their approaches and methods, to yield better results. One notable early success was the resolution of disputed authorship in twelve of the Federalist Papers by Frederick Mosteller and David Wallace.  While there is still some question about the possibility of initial assumptions and methodology (and, perhaps, always will), there is a lot of room for discussion. (Indeed, this article was published in French before the advent of computers by Cyrus Hoy in the late 1950s and early ’60s.)
Applications of literary studies, historical studies, social studies, gender studies, and many forensic cases and studies.  
Modern stylometry draws heavily for the sake of computers for statistical analysis , artificial intelligence and access to the growing corpus of texts available via the Internet .  Software systems such as Signature  (freeware produced by Dr. Peter Millican of Oxford University), JGAAP  (the Java Graphical Authorship Program Delivery -freeware produced by Patrick Juola of Duquesne University), pen   (an open-source R package for a variety of stylometric analyzes, including authorship attribution) and Stylene for Prof. Dr. Walter Daelemans of the University of Antwerp and Dr. Veronique Hoste of the University of Ghent, for non-expert.
Academic Venues and Events
Stylometric methods are discussed in several academic fields, mainly in the field of application for machine learning, natural language processing, or lexicography.
The International Association of Forensic Linguists (IAFL) organizes the Biennial Conference of the International Association of Forensic Linguists (13th edition in 2016 in Porto ) and publishes The International Journal of Speech, Language and the Law with Forensic stylistics as one of its central topics.
The Association for the Advancement of Artificial Intelligence (AAAI) has hosted several events on a subjective and stylistic analysis of text.   
PAN workshops (originally, Plagiarism Analysis, Authorship Identification, and Near-Duplicate Detection), organized by ACM SIGIR , FIRE , and more. KEY . Pan formulas shared challenge tasks for plagiarism detection, authorship identification  , author gender identification  , author profiling  , vandalism detection  , and other related text analysis tasks, many of which hinge on stylometry .
Case studies of interest
- Around 1370-1070 BC, as recorded in the Book of Judges , one tribe identified members of another tribe in order to kill them by asking them to say the word Shibboleth which in the dialect of the intended victims sounded like “sibboleth.” 
- In 1439, Lorenzo Valla showed that the Donation of Constantine was a forgery , an argument based on a comparison of the Latin with that used in authentic 4th-century documents.
- In 1952, the Swedish bishop Dick Helander was elected bishop of Strängnäs . The campaign was competitive and was published in a series of hundreds of articles published by the President of the Church of Strängnäs. Helander was first convicted of writing the letters and losing his position but bishop but later partially exonerated. The letters were studied with a number of different types of writing and other types of writing. .  
- In 1975, after Ronald Reagan had served as governor of California, he began presenting weekly radio commentaries syndicated to hundreds of stations. After his personal notes were made public in 2001, which were written by various aids used stylostatistical methods. 
- In 1996, the stylometric analysis of the controversial, pseudonymously authored book Primary Colors , performed by Vassar Professor Donald Foster  brought the field to the attention of a wider audience after identifying the author Joe Klein . (This case was only resolved after a handwriting analysis confirmed the authorship).
- In April 2015, researchers using stylometry techniques identified a play, Double Falsehood , as being the work of William Shakespeare .  Researchers analyzed 54 plays by Shakespeare and John Fletcher, and compared average sentence length, with the use of unusual words and quantified complexity and psychological valence of its language.
- In 2017, a group of linguists, computer scientists, and scholars analyzed the authoship of Elena Ferrante . Based on a corpus created at University of Padua containing 150 novels written by 40 authors, they analyzed Ferrante’s style based on seven of her novels. They were able to compare her writing style with 39 other novelists using, for example, pen  . The conclusion was the same for all of them: Domenico Starnone is the secret behind Elena Ferrante .  .
Data and Methods
Keywords: descriptive use of boxes, identifiers, and identifiers, the use of identifiers, the use of identifiers, and the identification of methods to distribute items in a space of feature variation.
Most methods are statistical in nature, but they are of the highest interest.
The most striking elements of a text in the past Most systems are based on lexical statistics, ie using the frequencies of words and text in the text (or its author). In this context, unlike in Retrieval information , the current occurrence of the most common forms is more common than the most common .  
The primary stylometric method is the invariant writer : a property held in common by all texts, or at least all texts An example of a writer is invariant frequency of function words used by the writer.
In one such method, the text is analyzed to the most common words. The text is then broken into a thousand words and chunk of words. This is a unique 50-number identifier for each chunk. These numbers place each chunk of text in a 50-dimensional space. This 50-dimensional space is flattened by a principal component analysis (PCA). This results in a display of points that corresponds to an author’s style. If two literary works are placed on the same plane, the result may be different.
Statistical data analysis
Methods used include cluster analysis and discriminant analysis .
Neural networks have been used to analyze authorship of texts. Text de unisputed authorship is used to train the neural network through processes such as backpropagation , where training error is calculated and used to update the process to increase accuracy. Through a process to non-linear regression, the network gains the ability to generalize its ability to read and write. Such techniques were applied to the long-standing claims of collaboration of Shakespeare with his contemporaries Fletcher and Christopher Marlowe ,   and confirmed the view, based on the fact that this collaboration had actually taken place.
A 1999 study showed that a neural network program reached 70% accuracy in determining authorship of poems it had not yet analyzed. This study from Vrije Universiteit examined identification of poems by three Dutch authors using only letter sequences such as “den”.
A study used Deep Belief Networks (DBN) for authentication and authentication for continuous authentication (CA). 
One problem with this method of analysis is that the network can become more easily analyzed. 
The genetic algorithm is another artificial intelligence technique used in stylometry. This involves a method that starts with a set of rules. An example rule might be, “If but it seems more than 1.7 times in every thousand words, then the text is author X”. The program is presented with text and uses the rules to determine authorship. The rules are tested against a set of known rules and is a fitness score. The 50 rules with the lowest scores are thrown out. The remaining 50 new rules are introduced. This is repeated until the evolved rules correctly attribute the texts.
One method for identifying style is called “rare peers”, and relates to individual habits of collocation . The use of certain words may, for a particular author, idiosyncratically entail the use of other, predictable words.
Authorship attribution in instant messaging
The distribution of Internet has shifted the authorship attribution towards online texts (web pages, blogs, etc.) electronic messages (e-mails, tweets, posts, etc.), and other types of written information that are far shorter than an average book, much less formal and more diverse in terms of expressive elements such as colors, layout, fonts, graphics, emoticons, etc. Efforts to take into account such aspects at the level of both structure and syntax were reported in.  In addition, content-specific and idiosyncratic cues have been introduced to unveil deliberate stylistic choices. 
Standard features stylometric-have-been employed to categorize the content of a chat over instant messaging ,  or the behavior of the participants  purpose of Identifying Attempts chat participants are Few and still early. Moreover, the similarity between spoken conversations and chat interactions has been neglected while being a key difference between chat and other types of written information.
- Forensic stylistics
- Linguistics and the Book of Mormon, Stylometry (Wordprint Studies)
- Moshe Koppel
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See also the academic journal Literary and Linguistic Computing (published by the University of Oxford ) and the Language Resources and Evaluation Journal.