/// <summary>
/// Calculates Z value (z-star) for confidence interval
/// </summary>
/// <param name="level">ConfidenceLevel for a confidence interval</param>
/// <param name="n">Sample size (n >= 3)</param>
public static double GetZValue(this ConfidenceLevel level, int n)
{
if (n <= 2)
{
throw new ArgumentOutOfRangeException(nameof(n), "n should be >= 3");
}
return(MathHelper.InverseStudent(1 - level.ToPercent(), n - 1));
}
public static IColumn CiUpper(ConfidenceLevel level) => new StatisticColumn($"CI {level.ToPercent()}% Upper",
s => new ConfidenceInterval(s.Mean, s.StandardError, level).Upper);
public static IColumn CiUpper(ConfidenceLevel level) => new StatisticColumn($"CI {level.ToPercent()}% Upper",
s => new ConfidenceInterval(s.Mean, s.StandardError, level).Upper);
public static IColumn CiLower(ConfidenceLevel level) => new StatisticColumn($"CI {level.ToPercent()}% Lower",
s => new ConfidenceInterval(s.Mean, s.StandardError, level).Lower, Priority.Additional);
public static IColumn CiLower(ConfidenceLevel level) => new StatisticColumn($"CI {level.ToPercent()}% Lower",
s => new ConfidenceInterval(s.Mean, s.StandardError, level).Lower, Priority.Additional);
