具体可以看帮助:
<!-- m --><a class="postlink" href="http://www.google.com.hk/search?source=ig&hl=zh-CN&rlz=1G1GGLQ_ZH-CNCN355&q=Base+SAS+9.2+Procedures+Guide+Statistical+Procedures+%283+Edition%29&aq=f&aqi=&aql=&oq=">http://www.google.com.hk/search?source= ... =&aql=&oq=</a><!-- m -->