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计算SU x形状矩阵
计算样本单元x特征矩阵提供了分析物种性状和解释变量之间关系的灵活的步。该矩阵是通过将样本单元x物种矩阵乘以物种x特征矩阵来获得的,但是矩阵所得到结果的内容,取决于性状是否标准化,以及乘法之后是否是加权平均步长(MCCUNE 2015)。为了大化SUX性状矩阵的通用性,包括性状之间的可比性,以及广泛的距离度量的可用性,我们建议首先将性状标准化为小至大,然后计算每个样本单位的丰度加权性状平均值。
* Step-by-Step Book 10 step PC-ORD guide, authored by our training specialist
Although some similar tools are available in PC-ORD and R, the user experience differs radically. PC-ORD is a Windows software program with a graphical user interface that does not require coding. PC-ORD offers ease of use, expert-driven analysis preference options, the power and flexibility of interactive graphics, a built-in help system, and free dedicated technical support. PC-ORD also allows advanced users to develop scripts through its "Batch" facility (introduced in v.6), as well as the ability to incorporate user-developed modules into the menu system.
Thank you for the wonderful news that v. 7 has now been released. Even though practically every multivariate statistical technique/method could alternatively be done using R language, I still prefer using PC-ORD for teaching ecology students multivariate statistics. PC-ORD is very user-friendly and offers, in one self-contained package, many powerful methods and a great toolbox (“Modify Data”) that ecology students really need and can quickly utilize in their research. An excellent feature is the textbook-like, built-in documentation explaining theoretical background in detail.
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