/// <summary>
/// Calculates probability.
/// </summary>
/// <param name="item"> element where includes item average and stdev </param>
/// <param name="element"> new test data element</param>
/// <returns>probability </returns>
private double CalculateProbability(SummaryListElement item, double element)
{
var probability =
(double)(1 / (Math.Sqrt(2 * Math.PI) * item.StandardDeviation)) *
Math.Exp(-(double)(Math.Pow(element - item.Average, 2) / (2 * Math.Pow(item.StandardDeviation, 2))));
return(probability);
}
/// <summary>
/// Calculates every class atribute average and stdev
/// </summary>
/// <param name="classDictionary"> Grouped elements by classes</param>
/// <returns>classSummary</returns>
private Dictionary <string, List <SummaryListElement> > GetClassSummary(Dictionary <string, List <CustomDataElement> > classDictionary)
{
Dictionary <string, List <SummaryListElement> > classSummary = new Dictionary <string, List <SummaryListElement> >();
foreach (var classItem in classDictionary)
{
classSummary.Add(classItem.Key, new List <SummaryListElement>());
for (int i = 0; i < classItem.Value[0].Elements.Count; i++)
{
List <double> temp = new List <double>();
foreach (var item in classItem.Value)
{
for (int j = 0; j < item.Elements.Count; j++)
{
if (j == i)
{
temp.Add(item.Elements[i]);
}
}
}
var average = Average(temp);
var standartDeviation = StandartDeviation(temp, average);
var summaryListElement = new SummaryListElement()
{
Average = average, StandardDeviation = standartDeviation
};
classSummary[classItem.Key].Add(summaryListElement);
}
}
return(classSummary);
}
