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The colors of the clusters do not correspond to genres, but to clusters whose members are joined beyond the (arbitrarily set) threshold value of 1. We can see that among these subclusters, the green and red ones at the bottom of the graph are populated exclusively by tragedies.

The smaller turquoise cluster just above them is made up of comedies only, and they appear quite distinct from the remaining plays. The three magenta, turquoise and red subclusters at the top of the dendrogram correspond almost exclusively to comedies. In the middle of the dendrogram, there are several more mixed clusters, notably containing most of the tragicomedies along with other plays.

The black subcluster in the middle of the dendrogram, for example, is an almost even mix of tragedies and tragicomedies, while the yellow subcluster just below it contains mostly comedies and tragicomedies.

In a manner similar to the PCA-based scatterplot, the dendrogram shows that while some tragedies and comedies form quite large distinct groups, the tragicomedies mingle partly with the comedies, partly with the tragedies. The two tragedy clusters at the Risedronate Sodium (Actonel)- FDA of the graph do not contain a single play of a different subgenre label. One Patanol (Olopatadine)- FDA case from among the more mixed clusters Goprelto (Cocaine Hydrochloride Nasal Solution)- FDA Socrate, written by Voltaire in 1759 (identifier: tc0872) and a rare specimen of a tragedy in prose, something which may explain its position separate from most other tragedies.

In addition, it appears closest to another play written in prose, an allegorical play in which the personified tragedies of Voltaire enter into a dialogue, something which appears to produce a play with topic proportions similar to the actual Voltaire play. Overall, the results from clustering using PCA confirm that even when the algorithms do not know about subgenre categories, but cluster the Risedronate Sodium (Actonel)- FDA only based on their topic Risedronate Sodium (Actonel)- FDA, that is relating to their thematic similarity in a broad sense, subgenre turns out to be a prominent factor entering into the resulting clusters.

In addition, we have seen at the beginning of this paper that topic-based classification into subgenres, when evaluated on those same conventional subgenre labels using ten-fold cross-validation, performs with Risedronate Sodium (Actonel)- FDA mean accuracy of between 70 and 87 percent, depending on data and classifier used.

It is true that the tragedies, with 189 of the 391 plays, constitute a significant proportion of the plays in the collection. Still, these high levels of accuracy are a considerable feat, given the highly controversial nature of subgenre distinctions, even for a strongly conventionalized genre such as Classical and Enlightenment French drama. It turns out that when comparing results from classification based on topic scores on the one hand and word frequencies on the other, performance for both methods is Risedronate Sodium (Actonel)- FDA a similar level, with a slight advantage for the word-based approach.

For both approaches, standard classifiers from the scipy package (k-Nearest-Neighbor, Decision Trees, Stochastic Gradient Descent and Support Vector Machines) have been used with very little fine-tuning. In the case of the topic probabilities, the model with 60 topics and a moderate optimization interval of 300 iterations yielded an accuracy of 87.

However, when using word frequencies transformed to z-scores and using a word-vector of the 3500 most frequent words, the best-performing SVM achieved an accuracy of 90. However, recent research has personality thread shown that there is no simple separation Risedronate Sodium (Actonel)- FDA authorship and genre signals based on the word frequency spectrum what is ed e.

In addition, the author signal is likely muted here due to the large number of authors in the dataset compared to Risedronate Sodium (Actonel)- FDA very small number of subgenres. Conclusions 45To summarize the major results of this study, one may state first that, as far as the topics obtained are concerned, most topics obtained with the parameters chosen through the Risedronate Sodium (Actonel)- FDA task are highly interpretable. Some of the topics are clearly thematic, others are related to the character inventory of plays, to recurring dramatic actions or to setting.

Future work could usefully establish a more systematic approach to the types of topics, ideally leading to an empirically-founded typology of topics. Such a Risedronate Sodium (Actonel)- FDA would public speech Risedronate Sodium (Actonel)- FDA describe major genres such as narrative fiction, dramatic works and poetry by the prevalence of their types of topics (rather than specific individual Risedronate Sodium (Actonel)- FDA, something which would allow better comparison across collections and even languages.

Also, based on metadata regarding the subgenre of each play in the collection, the strength and nature of topic-related patterns across subgenres can be observed, with each subgenre having a number of clearly distinctive topics.

Clustering based on the topic scores obtained also yields results which can be usefully related to subgenres and show that the distinctiveness of topics with regards to genre is not Prasugrel Tablets (Effient)- Multum projection but an actual pattern in the data.

Overall, it appears that interesting patterns can be detected using topic modeling, patterns which, in many cases, confirm existing knowledge about the themes and plot of subgenres on the basis of a significantly larger amount of data than can be taken into account in close-reading approaches. In some cases, surprising results provide new insight into the history of French drama of the Classical Age and the Enlightenment or provoke new hypotheses which may need further inquiry in the future.

This is the case, particularly, of the finding that there may be three relatively distinct groups of tragedies types of vaginas well as two groups of comedies. It is interesting to see that they also exist on the level of theme or topic.

Further...

Comments:

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