国外的入门教程，pdf 132页
内容：
What is SAS®?.............................................................................................................................4
How do we use SAS? ..................................................................................................................4
SAS Command Files .......................................................................................................................5
SAS FUNCTIONS ..........................................................................................................................7
Entering Data................................................................................................................................16
PROC PRINT...............................................................................................................................17
The PROC PRINT Statement....................................................................................................17
The BY Statement .....................................................................................................................17
The VAR Statement ..................................................................................................................17
PROC SORT ................................................................................................................................19
The PROC SORT Statement .....................................................................................................19
The BY Statement .....................................................................................................................19
PROC PLOT.................................................................................................................................20
The PROC PLOT Statement .....................................................................................................20
The PLOT Statement.................................................................................................................20
The BY Statement .....................................................................................................................21
PROC MEANS.............................................................................................................................22
The PROC MEANS Statement .................................................................................................22
The VAR Statement ..................................................................................................................22
The FREQ Statement.................................................................................................................23
The WEIGHT Statement...........................................................................................................23
The BY Statement .....................................................................................................................23
PROC UNIVARIATE...................................................................................................................24
The PROC UNIVARIATE Statement.......................................................................................24
The VAR Statement ..................................................................................................................25
The FREQ Statement.................................................................................................................25
The WEIGHT Statement...........................................................................................................25
The BY Statement .....................................................................................................................25
The OUTPUT Statement...........................................................................................................26
PROC TTEST...............................................................................................................................28
The PROC TTEST Statement ...................................................................................................28
The CLASS Statement ..............................................................................................................28
The VAR Statement ..................................................................................................................28
The BY Statement .....................................................................................................................29
Paired T-tests............................................................................................................................29