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        <title>A Calibration Method for Evaluation of Sentiment Analysis</title>
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        <namePart type="given">Sharmila</namePart>
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            <title>Proceedings of the International Conference Recent Advances in Natural Language Processing, RANLP 2017</title>
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            <namePart type="given">Ruslan</namePart>
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            <namePart type="given">Galia</namePart>
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    <abstract>Sentiment analysis is the computational task of extracting sentiment from a text document – for example whether it expresses a positive, negative or neutral opinion. Various approaches have been introduced in recent years, using a range of different techniques to extract sentiment information from a document. Measuring these methods against a gold standard dataset is a useful way to evaluate such systems. However, different sentiment analysis techniques represent sentiment values in different ways, such as discrete categorical classes or continuous numerical sentiment scores. This creates a challenge for evaluating and comparing such systems; in particular assessing numerical scores against datasets that use fixed classes is difficult, because the numerical outputs have to be mapped onto the ordered classes. This paper proposes a novel calibration technique that uses precision vs. recall curves to set class thresholds to optimize a continuous sentiment analyser’s performance against a discrete gold standard dataset. In experiments mapping a continuous score onto a three-class classification of movie reviews, we show that calibration results in a substantial increase in f-score when compared to a non-calibrated mapping.</abstract>
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%0 Conference Proceedings
%T A Calibration Method for Evaluation of Sentiment Analysis
%A Satthar, F. Sharmila
%A Evans, Roger
%A Uchyigit, Gulden
%Y Mitkov, Ruslan
%Y Angelova, Galia
%S Proceedings of the International Conference Recent Advances in Natural Language Processing, RANLP 2017
%D 2017
%8 September
%I INCOMA Ltd.
%C Varna, Bulgaria
%F satthar-etal-2017-calibration
%X Sentiment analysis is the computational task of extracting sentiment from a text document – for example whether it expresses a positive, negative or neutral opinion. Various approaches have been introduced in recent years, using a range of different techniques to extract sentiment information from a document. Measuring these methods against a gold standard dataset is a useful way to evaluate such systems. However, different sentiment analysis techniques represent sentiment values in different ways, such as discrete categorical classes or continuous numerical sentiment scores. This creates a challenge for evaluating and comparing such systems; in particular assessing numerical scores against datasets that use fixed classes is difficult, because the numerical outputs have to be mapped onto the ordered classes. This paper proposes a novel calibration technique that uses precision vs. recall curves to set class thresholds to optimize a continuous sentiment analyser’s performance against a discrete gold standard dataset. In experiments mapping a continuous score onto a three-class classification of movie reviews, we show that calibration results in a substantial increase in f-score when compared to a non-calibrated mapping.
%R 10.26615/978-954-452-049-6_084
%U https://doi.org/10.26615/978-954-452-049-6_084
%P 652-660

Markdown (Informal)

[A Calibration Method for Evaluation of Sentiment Analysis](https://doi.org/10.26615/978-954-452-049-6_084) (Satthar et al., RANLP 2017)

• A Calibration Method for Evaluation of Sentiment Analysis (Satthar et al., RANLP 2017)

ACL

• F. Sharmila Satthar, Roger Evans, and Gulden Uchyigit. 2017. A Calibration Method for Evaluation of Sentiment Analysis. In Proceedings of the International Conference Recent Advances in Natural Language Processing, RANLP 2017, pages 652–660, Varna, Bulgaria. INCOMA Ltd..