/// <summary>
/// Create a new <see cref="StandardDeviation"/> statistic specifying
/// the initial observation.
/// </summary>
/// <remarks>
/// If <see cref="Value"/> is invoked immediately after instantiating a
/// <see cref="StandardDeviation"/> instance using this constructor, the
/// returned value is zero (0.0).
/// </remarks>
/// <param name="initialObservation">
/// The value of the initial observation.
/// </param>
public StandardDeviation(double initialObservation)
{
_variance = new Variance(initialObservation);
Observations = _variance.Observations;
}
/// <overloads>
/// Create and initialize a StandardDeviation statistic.
/// </overloads>
/// <summary>
/// Create a new <see cref="StandardDeviation"/> statistic.
/// </summary>
/// <remarks>
/// If <see cref="Value"/> is invoked immediately after instantiating a
/// <see cref="StandardDeviation"/> instance using this constructor,
/// the returned value is <see cref="Double.NaN"/>.
/// </remarks>
public StandardDeviation()
{
_variance = new Variance();
}
