/// <summary>
/// Calculates the normalized contrast angle dot-product or 1 - angle/90 between two vectors,
/// with both normalized to a unit vector first.
/// </summary>
/// <param name="s">The other vector</param>
/// <returns>Normalized contrast angle dot-product of normalized vectors</returns>
public double NormalizedContrastAngleUnitVector(Statistics s)
{
var stat1 = NormalizeUnit();
var stat2 = s.NormalizeUnit();
return stat1.NormalizedContrastAngle(stat2);
}