During the compilation phase, the program data vector is created. The program data vector includes the two automatic variables _N_ and _ERROR_. The descriptor portion of the new SAS data set is created at the end of the compilation phase. The descriptor portion includes the name of the data...
max(),min(),avg()返回非空值的平均值等等);加工的第二个变量NO2是指name非缺失的个数;加工的第三个变量Height_Square;加工的第四个变量是BMI,这个变量用的不是原数据中的变量,所以要括号括起来然后告诉SAS它用的是上面加工出来的第一个变量所以必须用CALCULATED作为要用的变量的前缀。
An analytical database is a highly complex and large volume specialty database used by analytical applications such as SAS, SPSS, SSAS, and R. It is either built separately or as a part of the same platform as the data warehouse, and it supports complex and long-running queries that create...
七、SAS Automatic Variables 1) _N_ :DATA步中SAS的循环次数;2)_ERROR_:取值0(无错误)和1(有错误);3)FIRST.variable:当SAS在读取该变量时,首次出现一个value,则为1,否则为0; LAST.variable:当SAS在读取该变量时,最后出现一个value,则为1,否则为0; 【注意】:FIRST.variable和LAST.variable:仅在DATA步...
The following SAS program is submitted: data WORK.REVENUE(drop=Sales Returns Price); set WORK.PRODUCTS(keep=ProdId Price Sales Returns); Revenue=Price*(Sales-Returns); run; How many variables does the WORK.REVENUE data set contain? A. 2 B. 3 C. 4 D. 6 答案:A 本题知识点:DROP=选项,...
对于只想拿SAS认证的人,如果熟练掌握网上流传甚广的sas真题70题,通过base认证基本就没问题。Q 1 1. The following SAS program is submitted: data WORK.TOTAL; set WORK.SALARY; by Department Gender; if First.<_insert_code_> then Payroll=0; Payroll+Wagerate; if Last.<_insert_code_>; run; The...
1.Create temporary and permanent SAS data sets. 2.Investigate SAS data libraries using base SAS utility procedures. 3.Access data. 4.Combine SAS data sets. 5.Create and manipulate SAS date values. 6.Control which observations and v...
data=source.dosing(keep=subject startdt enddt)out=dosing;by subject startdt;run;/**/data dosing;setdosing;by subject;retain firstdose lastdose;/*在DATA步中,SAS会创建两个临时变量FIRST.variable 和 LAST.variable,来鉴别每个BY group的开始和结束。*//*比如,这里by后面的变量是subject,所以SAS会自动生...
先来总结一下DATA步的运行顺序,其余语句按照运行逻辑运行 DATA 语句 数据读入语句 INPUT (自定义输入数据,定义其字段名,字段类型以及字段观测值) SET (输入已有的数据集,指定逻辑库名称以及数据集名称:SASHE…
对于只想拿SAS认证的人,如果熟练掌握网上流传甚广的sas真题70题,通过base认证基本就没问题。 Q 1 1. The following SAS program is submitted: data WORK.TOTAL; set WORK.SALARY; by Department Gender; if First.<_insert_code_> then Payroll=0; Payroll+Wagerate; if Last.<_insert_code_>; run; The...