public void ComputeDistance(Author otherAuthor, out Dictionary <string, double> val, out Dictionary <string, double> stdDev, IEnumerable <string> featureNames)
{
val = new Dictionary <string, double>();
stdDev = new Dictionary <string, double>();
foreach (string featureName in featureNames)
{
if (mFeatures.ContainsKey(featureName))
{
double avg = GetAvg(featureName);
double var = Math.Pow(GetStdDev(featureName), 2);
double otherAvg = otherAuthor.GetAvg(featureName);
double otherVar = Math.Pow(otherAuthor.GetStdDev(featureName), 2);
val.Add(featureName, Math.Abs(avg - otherAvg));
stdDev.Add(featureName, Math.Sqrt(var + otherVar)); // http://stattrek.com/random-variable/combination.aspx
}
else
{
Prediction <string> p = mPredictions[featureName];
try { val.Add(featureName, p.First(x => x.Dat == otherAuthor.mName).Key); }
catch { val.Add(featureName, -666); }
}
}
}