我安装了Python2.5.2，总之按照PLS插件中的要求把PLS装进了spss17中，貌似可以用了。我用主成分分析中的因子作为潜变量，这些观测变量作为自变量，分析不出来。scipy and numpy？？是什么东东呢？怎么别人没有提到呢？请帮帮忙呀

程序运行提示是这样的：
PLS FAC4_1 MLEVEL=S FAC3_1 MLEVEL=S FAC2_1 MLEVEL=S FAC1_1 MLEVEL=S WITH B1.A.12 B1.B.1 B1.B.2 B1.B.3 B1.B.4 B1.B.5 B1.B.6 B1.B.7 B1
   .B.8 B1.B.9 B1.B.10 B1.B.11 B1.B.12
  /CRITERIA LATENTFACTORS=5
  /OUTDATASET CASES=Infect LATENTFACTORS=latent PREDICTORS=estimates.
This module requires scipy and numpy.  One or more was not found.  Please download
from www.scipy.org and try again.  Be sure to get the version matching your Python version.
Extension command  PLS  could not be loaded. The module or a module that it requires may be missing, or there may be syntax errors in it.