Statistic
constructor(id: Int = statDataCounter++, context: String? = null, subject: String? = null, stat_name: String = "", stat_count: Double? = null, average: Double? = null, std_dev: Double? = null, std_err: Double? = null, half_width: Double? = null, conf_level: Double? = null, minimum: Double? = null, maximum: Double? = null, sum_of_obs: Double? = null, dev_ssq: Double? = null, last_value: Double? = null, kurtosis: Double? = null, skewness: Double? = null, lag1_cov: Double? = null, lag1_corr: Double? = null, von_neumann_lag1_stat: Double? = null, num_missing_obs: Double? = null)