使用SIMCA软件(V14.1, Umetrics, Umea, Sweden)对数据进行UV格式化（Unit Variance Scaling）和平均中心化（Mean-Centered）处理，以获得更加可靠且更加直观的结果。软件进行自动化模型拟合分析，获得最可靠数学模型的主成分数目。
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The key thing to remember about random variables is that actual observations are centered around an average, or mean value.
对于随机的变化关键要记住的是，实际的观测资料都在平均数或者中间值周围。
Becoming other-centered and giving does not mean that you have to sacrifice your feelings, wants and needs in order to satisfy your partner.
为对方着想而付出并不意味着你必须牺牲自己的感情、需求去迎合伴侣。
Well, the mean is always .2 no matter how many policies you write, so it's going to be--we're going to have a normal distribution centered on .2.
不论你签了多少份保单,均值永远是0.2,所以这就是一个关于x=0.2对称的,正态分布
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