private SentimentAnalysisResults ScoreValence(IList <double> sentiments, string text)
{
if (sentiments.Count == 0)
{
return(new SentimentAnalysisResults()); //will return with all 0
}
double sum = sentiments.Sum();
double puncAmplifier = PunctuationEmphasis(text);
sum += Math.Sign(sum) * puncAmplifier;
double compound = SentimentUtils.Normalize(sum);
SiftSentiments sifted = SiftSentimentScores(sentiments);
if (sifted.PosSum > Math.Abs(sifted.NegSum))
{
sifted.PosSum += puncAmplifier;
}
else if (sifted.PosSum < Math.Abs(sifted.NegSum))
{
sifted.NegSum -= puncAmplifier;
}
double total = sifted.PosSum + Math.Abs(sifted.NegSum) + sifted.NeuCount;
return(new SentimentAnalysisResults
{
Compound = Math.Round(compound, 4),
Positive = Math.Round(Math.Abs(sifted.PosSum / total), 3),
Negative = Math.Round(Math.Abs(sifted.NegSum / total), 3),
Neutral = Math.Round(Math.Abs(sifted.NeuCount / total), 3)
});
}
private static SiftSentiments SiftSentimentScores(IList <double> sentiments)
{
SiftSentiments siftSentiments = new SiftSentiments();
foreach (var sentiment in sentiments)
{
if (sentiment > 0)
{
siftSentiments.PosSum += (sentiment + 1); //1 compensates for neutrals
}
if (sentiment < 0)
{
siftSentiments.NegSum += (sentiment - 1);
}
if (sentiment == 0)
{
siftSentiments.NeuCount++;
}
}
return(siftSentiments);
}
private static SiftSentiments SiftSentimentScores(List <double> sentiments)
{
var siftSentiments = new SiftSentiments();
foreach (var sentiment in sentiments)
{
if (sentiment > 0)
{
siftSentiments.PosSum += sentiment + 1; //1 compensates for neutrals
}
if (sentiment < 0)
{
siftSentiments.NegSum += sentiment - 1;
}
if (sentiment.Equals(0))
{
siftSentiments.NeuCount++;
}
}
return(siftSentiments);
}
