/// <summary>
/// Shifts the claims partially to the future by a given factor.
/// </summary>
/// <param name="shiftFactor">Factor between 0 and 1 the claims are to be partially shifted by.</param>
/// <returns>The triangle shifted by the given factor.</returns>
public ITriangle Shift(decimal shiftFactor)
{
if (shiftFactor < 0m || shiftFactor > 1m)
{
throw new ArgumentOutOfRangeException(nameof(shiftFactor), "The shift factor was out of its legal range between 0 and 1.");
}
ITriangle shifted = (ITriangle)Activator.CreateInstance(this.GetType(), Periods - 1);
for (int i = 0; i < Periods - 1; i++)
{
IEnumerable <decimal> claims = GetRow(i)
.Take(Periods - i - 1)
.Zip(GetRow(i + 1), (x, y) => (1m - shiftFactor) * x + shiftFactor * y);
shifted.SetRow(claims, i);
}
return(shifted);
}