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In recent years, text classification in sentiment analysis has mostly focused on two types of classification, the distinction between objective and subjective text, i.e. subjectivity detection, and the distinction between positive and negative subjective text, i.e. polarity classification. So far, there has been little work examining the distinction between definite polar subjectivity and indefinite polar subjectivity. While the former are utterances which can be categorized as either positive or negative, the latter cannot be categorized as either of these two categories. This paper presents a small set of domain independent features to detect indefinite polar sentences. The features reflect the linguistic structure underlying these types of utterances. We give evidence for the effectiveness of these features by incorporating them into an unsupervised rule-based classifier for sentence-level analysis and compare its performance with supervised machine learning classifiers, i.e. Support Vector Machines (SVMs) and Nearest Neighbor Classifier (kNN). The data used for the experiments are web-reviews collected from three different domains.
A general concept of perspective is proposed, using the mathematical notion of vector spaces as metaphor. The concept is applied to different phenomena which use perspective: spatiotemporal perspective, lexical semantics (prototypes and features), perspectivation in syntax and lexical inferences. Criteria for constructing a superordinate perspective for two given perspectives are developed.
This article deals with the notion of reality. During the last twenty years, public discourse in western societies has identified the opposition between the real and the virtual as one of the cultural key questions. Taking concrete examples as a point of departure, the paper investigates the semantics of the polysemic terms virtual and real. A semiotic model of the relation between (human) organisms, concepts and signs is used in order to demonstrate that the virtual cannot be adequately described as something opposed to reality, but must be seen as an indispensable part of it. The way in which organisms constitute reality is discussed in the light of the basic cognitive operations of categorization and the formation of conceptual relations, and also of their linguistic counterparts. The apparent conflict between the real and the virtual, which has led many critics to develop apocalyptic visions of the end of civilization, is, in fact, a phantom, product of an outdated theory of semantics.
Sentiment analysis has so far focused on the detection of explicit opinions. However, of late implicit opinions have received broader attention, the key idea being that the evaluation of an event type by a speaker depends on how the participants in the event are valued and how the event itself affects the participants. We present an annotation scheme for adding relevant information, couched in terms of so-called effect functors, to German lexical items. Our scheme synthesizes and extends previous proposals. We report on an inter-annotator agreement study. We also present results of a crowdsourcing experiment to test the utility of some known and some new functors for opinion inference where, unlike in previous work, subjects are asked to reason from event evaluation to participant evaluation.
Der vorliegende Aufsatz gibt einen Überblick über das syntaktische, prosodische und semantische Verhalten sowie die textuelle Funktion kausaler Konnektoren im heutigen Deutsch. Im ersten Abschnitt wird Textkohärenz in räumliche, zeitliche und kausale Kohärenz unterteilt. Räumliche und zeitliche Kohärenz werden zu einem erheblichen Teil durch grammatische Sprachmittel kodiert, während kausale Kohärenz vor allem durch lexikalische Mittel ausgedrückt wird: durch Präpositionen, Konjunktionen und Adverbien. Im zweiten Abschnitt werden die wichtigsten kausalen Konnektoren des Gegenwartsdeutschen vorgestellt und in ihren syntaktischen und semantischen Haupteigenschaften beschrieben. Der dritte Abschnitt behandelt das linguistische Konzept der Ursache vor dem Hintergrund allgemeinerer philosophischer Reflexionen über Kausalität. Das Konzept der Verursachung wird zurückgeführt auf die zugrundeliegenden Konzepte der Situation und der Bedingung. Der vierte Abschnitt ist der Unterscheidung zwischen drei Arten kausaler Verknüpfungen gewidmet, die als dispositionelle, epistemische und deontisch-illokutionäre bezeichnet werden. Empirisch erlauben kausale Verknüpfungen häufig mehr als eine dieser Lesarten. Die folgenden Unterabschnitte untersuchen im Detail die syntaktischen, prosodischen und semantischen Bedingungen, durch die epistemische und deontische Lesarten kausaler Verknüpfungen möglich werden. Als wichtigste Faktoren, die die Interpretation beeinflussen, werden herausgestellt: syntaktische, prosodische und informationelle Integration der verknüpften Ausdrücke, Definitheit der Ursache sowie modale Umgebungen.