无法从princomp生成分数，无法生成双线图 [英] scores not being generated from princomp, unable to generate biplot

问题描述

当我想使用不是由princomp本身生成的协方差或相关矩阵时，我遇到了princomp的问题，特别是biplot.为简单起见，我将使用比我要处理的数据集小的数据集.

I am having issues with princomp, specifically biplot, when I want to use a covariance or correlation matrix not generated by princomp itself. For simplicity I will use a much smaller dataset than the one I am dealing with.

cr <- cov.wt(USArrests)
biplot(princomp(data = USArrests, covmat = cr))

给我错误

Error in biplot.princomp(princomp(data = USArrests, covmat = cr)) : 
  object 'princomp(data = USArrests, covmat = cr)' has no scores

似乎在这里发生了一些简单的事情，但到目前为止，谷歌一直无济于事.

Seems like something simple going on here, but google has thus far been unhelpful.

推荐答案

princomp中的data参数只能由类'formula'的S3方法"使用.因此，您需要通过以下两种方式之一来指定princomp调用:

The data argument in princomp can only be used by the "S3 method for class 'formula'". Thus, you need to specify your princomp call in either of these two ways:

cr <- cov.wt(USArrests)
pr1 <- princomp(x = USArrests, covmat = cr)
pr2 <- princomp(formula = ~ ., data = USArrests, covmat = cr)

biplot(pr1)
biplot(pr2)

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