SAS--chapter4

libname clinic ‘D:\SAS‘; 
data clinic.admitfee;
　　set sasueser.admit;
run;

proc sort data=clinic.admitfee  out=admit;  /*proc 排序 排谁 输出到哪lib.name*/
by age;
run;

proc print data=admit label;  /*打印 打谁 label？*/
var age height weight fee;   /*变量 1 2 3 4 */
label fee=‘admission fee‘; /* 更换变量名*/
run;

proc print data=admit noobs; /*no obs 取消显示observations*/
var age height;
where age>30;  /*where 给变量指定一个条件*/
run;           /*character必须要加引号，区分大小写*/

proc print data=admit;
id id;   /*id 用后面的变量（可以不是一个）取代obs*/
run;    /*当id后面的变量 和 var 后面的重复，那么这个变量会出现2次*/

data work.admit2;  *创建数据集名称，位置;
    set sasuser.All; *引用该数据集;
run;

ods listing;
proc print data=work.admit2;
    where location contains ‘all‘; *变量location中contains all 子字符串的观察单位;
run;    
                           *contains 可以用 ?  代替;
proc print data=admit;
    where age>30 and age<50;   *逻辑关系 AND or & , OR or |;
run;

proc print data=admit;
    where age<30 or( age>50 and sex=‘M‘);   *逻辑关系 AND or & , OR or |;
run;

PROC PRINT DATA=ADMIT;
    WHERE ACTLEVEL IN (‘LOW‘,‘MOD‘);  * in 使得表达简洁;
run;

proc sort data=clinic.admit out=wdadmit; 
        by weight age;            *根据先weight后age排序，默认升序;
run;

proc print data=wdadmit;
run;

proc sort data=clinic.admit out=dwdadmit;
    by descending weight  descending age; *降序
run;
proc print data=dwdadmit;
run;

proc print data=admit;
    var name age height weight fee;
    where actlevel=‘LOW‘;
    sum fee;      * 给变量求和，并创建新的一行;
run;

proc sort data=clinic.admit out=admit;
　　by actlevel;
run;
proc print data=admit;
　　sum fee;
by actlevel; *按照分类变量求和，必须现根据该分类变量排序;
run;

proc sort data=clinic.admit out=admit;
by actlevel; 
run;

proc print data=admit;
sum fee;
by actlevel; *按照分类变量求和，必须现根据该分类变量排序;
run;

proc print data=admit;
sum fee;
by actlevel; *使用by 和 id联合使用，自定义layout,考虑id的作用;
id actlevel;
run;

proc print data=admit;
sum fee;
by actlevel; 
id actlevel;
pageby actlevel; *pageby后面的变量，必须在by中被指定;
run;
proc print data=admit double; *两倍行距;
sum fee;
run;

title1 ‘Heart Rates for Patients with‘; *数字可以说是1-10;
title11 ‘Increased Stress Tolerance Levels‘;
proc print data=admit;
run;

footnote1 ‘Data from Treadmill Tests‘;
footnote3 ‘1st Quarter Admissions‘;
proc print data=admit;
run;

title; *取消title和footnote;
footnote; *默认的title是SAS程序;
proc print data=admit;
run;

proc print data=admit label ; *临时的给变量名加label;
label fee=‘total fee‘; * ‘total fee‘n =‘fee‘ 有空格的情况;
run;
proc print data=admit label;
label fee=‘total fee‘ sex=‘gender‘; 
run;　　

proc print data=clinic.admit;
var actlevel fee;
where actlevel=‘HIGH‘;
format fee dollar4.; *format 临时的改变数据的显示格式;
run;
proc print data=clinic.admit;
var actlevel fee;
where actlevel=‘HIGH‘;
format fee 5.2;
run;

data clinic.admit;
set sasuser.admit;
label fee=‘tatal fee‘;
run;

proc print dara=clinic.admit label;  *!!!print 时仍需要label;
run;

proc print data=admit split=‘*‘;
label fee=‘f*e*e‘;                *将变量名按照特殊的格式分开;
run;