The KEEP statement causes a DATA step to write only the variables that you specify to one or more SAS data sets. The KEEP statement applies to all SAS data sets that are created within the same DATA step and can appear anywhere in the step.

SAS Data Set Options KEEP= Data Set Option For an input data set, specifies the variables to process; for an output data set, specifies the variables to write to the data set.

2022年1月17日 · You can use the KEEP and DROP statements in SAS when creating a new dataset to keep or drop specific variables from an existing dataset. These statements use the following basic syntax: Method 1: Choose Which Columns to KEEP. set original_data; keep var1 var3; run; Method 2: Choose Which Columns to DROP. set original_data; drop var5; run;

2022年7月6日 · 在创建一个新的数据集时，你可以在SAS中使用KEEP和DROP语句来保留或删除现有数据集中的特定变量。 这些语句使用以下基本语法。 方法1：选择要保留的列. data new_data; set original_data; keep var1 var3; run; 方法2：选择要删除的列. data new_data; set original_data; drop var5; run;

2020年12月6日 · In SAS, you can select variables from a dataset with the KEEP=-option and the DROP=-option. The KEEP=-option specifies which variables to select, while the DROP=-option indicates which variable to ignore.

2024年9月17日 · The KEEP statement causes a DATA step to write only the variables that you specify to one or more SAS data sets. The KEEP statement applies to all SAS data sets that are created within the same DATA step and can appear anywhere in the step.

The DROP, KEEP, and RENAME statements or the DROP=, KEEP=, and RENAME= data set options control which variables are processed or output during the DATA step. You can use one or a combination of these statements and data set options to achieve the results you want. The action taken by SAS depends largely on whether you

2021年11月3日 · 继续之前的读书笔记，本次讲解sas主要的变量操作，包括基本赋值语句、累加语句、keep语句、retain语句、array语句、rename语句、length语句。 1.基本 赋值语句 z=x y; z= sum (x,y ) ; sum 函数的好处是可以克服缺失值的影响； 2.如果表达式中既有数值型 变量 又有字符 …

The KEEP= option tells SAS which variables you want to keep in a data set. If you place the KEEP= option on the SET statement, SAS keeps the specified variables when it reads the input data set. On the other hand, if you place the KEEP= option on the DATA statement, SAS keeps the specified variables when it writes to the output data set.

2020年4月28日 · 1: 在statements使用KEEP語法保留部分變項。 2、3: 在讀取data同時即使用KEEP語法 (keep=)，檔案aa1, aa2, aa3的變項相同。 在statements使用DROP語法捨去部分 …