摘要: Statistical analyses of genetic data are now central [阅读全文]

摘要:以下是常用的数值截断函数 INT(自变量)：返回自变量的整数部分BOUND(自变量,精度) ：返回按指定的精度对自变量进行四舍五入的结果CELL(自变量) ：返回不小于自变量的最小整数部分FLOOR([阅读全文]

摘要:目标变量（Target variable）是指函数的结果所要赋予的变量。例如下面语句中的AvgScore是目标变量：AvgScore=mean(exam1,exam2,exam3); 除非在语句执行前[阅读全文]

摘要:调用SAS函数的一般形式为：函数名（自变量1，自变量2，。。。） 其中自变量可以是常数、变量、函数、表达式 某些函数的各个自变量都有不同的含义，所以其自变量的次序不是任意的；而另一些函数的多个自变量[阅读全文]

摘要:SAS提供了比一般程序设计语言多几倍的标准函数可以直接用在数据步的计算中，其中包括所有语言都有的数学函数、字符串函数，还包括特有的统计分布函数、分位数函数、随机数函数、日期时间函数、财政金融函数，等等。[阅读全文]

摘要:Throughout the business world, companies recognize that certification is the way to stay abreast of t[阅读全文]

摘要:The APPEND procedure adds the observations from one SAS data set to the end of another SAS data set.[阅读全文]

摘要:Subscripted variables can be used to easily read groups of values in the input statement. The followi[阅读全文]

摘要:Symbol statements (symbol, symbol1,..., symbol255) are used to control some of the behavior of the pl[阅读全文]

摘要:Up to 10 title lines can be placed on printouts generated by SAS by using title statements. Each titl[阅读全文]

摘要:To correct errors in large data sets the update statement can be used: data new; update old changes;[阅读全文]

摘要:The where statement can be used with any procedure to restrict the action of that procedure to observ[阅读全文]

摘要:The X command can be used to execute operating system commands without leaving SAS. The form is X 'o[阅读全文]

摘要:The SAS array statement is used to easily tag variables in a data set for processing. The array state[阅读全文]

摘要:The @ symbol at the end of an input statement in the data step tells SAS that not to move to the next[阅读全文]

摘要:Used in conjunction with a SAS procedure, the by statement specifies variables in the data set which[阅读全文]

摘要:The cards statement specifies that the values of the variables appearing in the input statement are t[阅读全文]

摘要:SAS data sets are stored on disk in groups called a data catalog or library. When a data set is creat[阅读全文]

摘要:A character variable takes values which consists of letters or words. Numeric variables take number v[阅读全文]

摘要:The command prompt can be used to issue commands to the underlying operating system, via the X comman[阅读全文]