耐受性Factor计算双面的精确公差因子k（可选地用于单侧）p含量和（1-alpha） - 离子公差间隔ti = [xmean - k * s，xmean + k * s]，在哪里Xmean =均值（x），s = std（x），x = [x_1，...，x_n]是从分布n（mu，sig2）的随机样本，具有未知的平均mu和方差sig2。
确定公差因子K，使得具有置信度（1-α）的公差间隔至少覆盖分布N（mu，Sigma ^ 2）的馏分P（'覆盖'），即
Prob[ Prob( Xmean - k * S < X < Xmean + k * S ) >= p ]= 1-alpha, for X ~ N(mu,sig2) which is independent with Xmean and S.
SYNTAX:
k = ToleranceFactor(n,coverage,confidence)
k = ToleranceFactor(n,coverage,confidence,m,nu,d2,options)
k =容忍物质活动器（n，coverage，confence，[]，[]，[]，选项）

参考文献：

Krishnamoorthy K, Mathew T. (2009). Statistical Tolerance Regions: Theory, Applications, and Computation. John Wiley & Sons, Inc., Hoboken, New Jersey. ISBN: 978-0-470-38026-0, 512 pages.

Witkovsky V. On the exact two-sided tolerance intervals for univariate normal distribution and linear regression. Austrian Journal of Statistics 43(4), 2014, 279-92. http:// ajs.data-analysis.at/index.php/ajs/article/viewFile/vol43-4-6/35

ISO 16269-6:2013: Statistical interpretation of data - Part 6: Determination of statistical tolerance intervals.https://www.iso.org/standard/57191.html.