/// <summary>
/// Gets the number of indexing bits required to produce a given standard error
/// </summary>
/// <param name="stdError">
/// Standard error, which determines accuracy and memory consumption. For large cardinalities, the observed error is usually less than
/// 3 * <paramref name="stdError" />.
/// </param>
/// <returns></returns>
private static int GetAccuracyInBits(double stdError)
{
double sqrtm = 1.04 / stdError;
var b = (int)Math.Ceiling(CardinalityEstimator.Log2(sqrtm * sqrtm));
return(b);
}