https://people.ok.ubc.ca/brioconn/nfactors/rawpar.sps

* Parallel Analysis Program For Raw Data and Data Permutations.* To run this program you need to first specify the data  for analysis and then RUN, all at once, the commands  from the MATRIX statement to the END MATRIX statement.* This program conducts parallel analyses on data files in which  the rows of the data matrix are cases/individuals and the  columns are variables;  Data are read/entered into the program  using the GET command (see the GET command below);  The GET   command reads an SPSS data file, which can be either the   current, active SPSS data file or a previously saved data file;  A valid filename/location must be specified on the GET command;  A subset of variables for the analyses can be specified by using  the "/ VAR =" subcommand with the GET statement;  There can be  no missing values.问题1：链接里说需要使用“GET命令”运行矩阵，请问SPSS中要到哪里输入GET命令啊？谢谢大神相助！

另外还想讨论一个问题。现在探索性因子分析一般都是使用特征值大于1和碎石图的方法来判断公因子数目，但特征值法只能应用于主成分分析，碎石图法存在主观性，个人感觉平行分析本身的假设（基于实践数据得出的因子特征值大于随机高百分位数因子特征值）和适用性均要优于前面两种方法。可是为什么国内研究几乎很少见到平行分析？平行分析的局限有哪些呢？