public double Median(Statistics weights)
{
try
{
var dict = new Dictionary <double, double>();
for (int i = 0; i < _list.Length; i++)
{
double value = _list[i];
double weight;
dict.TryGetValue(value, out weight);
weight += weights._list[i];
dict[value] = weight;
}
var keys = dict.Keys.ToArray();
Array.Sort(keys);
double total = weights.Sum();
double sum = 0;
for (int i = 0; i < keys.Length; i++)
{
sum += dict[keys[i]];
if (sum >= total / 2)
{
return(keys[i]);
}
}
return(double.NaN);
}
catch
{
return(double.NaN);
}
}
/// <summary>
/// Calculates a weighted mean average of the set of numbers.
/// See:
/// http://en.wikipedia.org/wiki/Weighted_mean
/// </summary>
/// <param name="weights">The weights</param>
/// <returns>Weighted mean</returns>
public double Mean(Statistics weights)
{
try
{
double sum = 0;
for (int i = 0; i < _list.Length; i++)
{
sum += _list[i] * weights._list[i];
}
return(sum / weights.Sum());
}
catch (Exception)
{
return(double.NaN);
}
}
public double Median(Statistics weights)
{
try
{
var dict = new Dictionary<double, double>();
for (int i = 0; i < _list.Length; i++)
{
double value = _list[i];
double weight;
dict.TryGetValue(value, out weight);
weight += weights._list[i];
dict[value] = weight;
}
var keys = dict.Keys.ToArray();
Array.Sort(keys);
double total = weights.Sum();
double sum = 0;
for (int i = 0; i < keys.Length; i++)
{
sum += dict[keys[i]];
if (sum >= total / 2)
{
return keys[i];
}
}
return double.NaN;
}
catch
{
return double.NaN;
}
}
/// <summary>
/// Calculates a weighted mean average of the set of numbers.
/// See:
/// http://en.wikipedia.org/wiki/Weighted_mean
/// </summary>
/// <param name="weights">The weights</param>
/// <returns>Weighted mean</returns>
public double Mean(Statistics weights)
{
try
{
double sum = 0;
for (int i = 0; i < _list.Length; i++)
sum += _list[i] * weights._list[i];
return sum / weights.Sum();
}
catch (Exception)
{
return double.NaN;
}
}
