增加一个数组的维数时，该数组所需的总存储空间会急剧增大，因此应慎用多维数组。
When you add dimensions to an array, the total storage needed by the array increases considerably, so use multidimensional arrays with care.
用文卡的话说，简化多维数据的多维标度就是试图“通过找出定义大多数行为的关键属性来降低数据的维数”。
Multidimensional scaling to simplify multidimensional data is an attempt "to reduce the dimensionality of data by finding key attributes defining most of the behavior, " says Venkatasubramanian.
多元统计分析的主成份分析方法是对多维矢量数据提取主要特征分量，以此达到压缩矢量维数的目的。
The principal component analysis in multivariate statistic analysis is a method of compressing the dimension of vector data by extracting principal typical components from sample data set.
结论多维irt更适合于条目数较少的多维量表的分析和评价。
Conclusion multidimensional IRT is more appropriate than unidimensional IRT for the analysis and evaluation of multidimensional and short scale.
结论多维irt更适合于条目数较少的多维量表的分析和评价。
Conclusion multidimensional IRT is more appropriate than unidimensional IRT for the analysis and evaluation of multidimensional and short scale.
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