黄燕 吴平《SAS统计分析及应用》 书中一些例子的SAS程序代码

				proc princomp data=data_prg.pcomp8_1 out= data_prg.pcomp8_1b 
				outstat= data_prg.pcomp8_1c  STANDARD;
				run;
				proc print data= data_prg.pcomp8_1b;
				proc print data= data_prg.pcomp8_1c;
				run;
				proc corr data=data_prg.pcomp8_1b;
				var x1-x4;
				with Prin1-Prin4;
				run;