This workflow shows how to import text from a csv file, convert it to documents, preprocess the documents and transform them into numerical document vectors. Finally a predictive model is trained on the vectors to predict the sentiment class of the documents.
Workflow 
Sentiment Analysis (Classification) of Documents
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Created with KNIME Analytics Platform version 4.3.1
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KNIME AG, Zurich, Switzerland
Version 4.3.1
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KNIME AG, Zurich, Switzerland
Version 4.3.0
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KNIME AG, Zurich, Switzerland
Version 4.3.0
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KNIME AG, Zurich, Switzerland
Version 4.3.0
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