public Deltas(CourseItem[] data)
{
var deltaArr = new DeltaArr(data);
GPos = deltaArr.positive.Length == 0 ? 0 : deltaArr.positive.Sum() / deltaArr.positive.Length;
GNeg = deltaArr.negative.Length == 0 ? 0 : deltaArr.negative.Sum() / deltaArr.negative.Length;
G = GPos + GNeg;
}
public Grad(CourseItem[] data)
{
if (SmallDataConstructor(data))
{
return;
}
var deltaArr = new DeltaArr(data);
GPos = deltaArr.positive.Length == 0 ? 0 : deltaArr.positive.Sum() / deltaArr.positive.Length;
GNeg = deltaArr.negative.Length == 0 ? 0 : deltaArr.negative.Sum() / deltaArr.negative.Length;
G = GPos + GNeg;
}
public GradSkv(CourseItem[] data)
{
if (SmallDataConstructor(data))
{
return;
}
var deltaArr = new DeltaArr(data);
GPos = deltaArr.positive.Length == 0 ? 0 :
Math.Sqrt(deltaArr.positive.Sum(d => d * d / deltaArr.all.Length));
GNeg = deltaArr.negative.Length == 0 ? 0 :
-Math.Sqrt(deltaArr.negative.Sum(d => d * d / deltaArr.all.Length));
double sumSq = deltaArr.all.Length == 0? 0 :
deltaArr.all.Sum(d => d * d * Math.Sign(d)) / deltaArr.all.Length;
G = Math.Sign(sumSq) * Math.Sqrt(Math.Abs(sumSq));
}
