例句與造句

1. This is necessary so that mathematical statements can be made about the sample and statistics computed from it, such as the sample mean and covariance.
2. If all weights are the same, i . e . \ textstyle w _ { i } / V _ 1 = 1 / N, then the weighted mean and covariance reduce to the unweighted sample mean and covariance above.
3. where the functions \ operatorname { E } and \ operatorname { cov } are respectively defined in Equations ( 1 ) and ( 2 ) below and are equivalent to the traditional definitions of sample mean and covariance; however, they are not meant to be statistical estimates of characteristics of a population.
4. Since such a portfolio is different from the Markowitz efficient portfolio it will have suboptimal risk / return characteristics with respect to the sample mean and covariance, but optimal characteristics when averaged over the many possible values of the unknown true mean and covariance . ( Michaud, 1998 ) Resampled Efficiency is covered by U . S . patent # 6, 003, 018, patent pending worldwide.
5. It's difficult to find sample mean and covariance in a sentence. 用sample mean and covariance造句挺難的