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Working with sentiment analysis.

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If I want to test sentiment score of any review or sentence. How can I do ?

When I run the line 22, unlist(lapply(posText, function(x) { str_split(x, "\n") })) gives error Error in substring(string, start, end) : invalid multibyte string at ' a ice , harmless date...

Calculating the polarity of the actual Vs predicted sentiment value- a metric of accuracy and precision of the model built.