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/// in singular form (no with s; different with statistics);
/// any quantity computed from values in a sample, often the mean. Technically speaking, a statistic can be calculated by applying any mathematical function to the values found in a sample of data.
/// </summary>
/// alias:
/// sample
/// statistic
/// stat
/// to make timeline flat|static such that analysis can be made on the trend;
/// use the short name as namespace such as to avoid confliction with type name, which is full long name;