SAS 数据集可以看作由若干行和列组成的表格,数据集的每一行称为一个观测(Observation),每一列称为一个变量(Variable),变量可以取不同的类型值,如整数型、浮点值、时间值、字符串、货币值等。 如图1-3所示的数据集范例中包括了3条观测,代表了3个客户的情况;包含5个变量,分别为客户编号(ID)、姓名(name)、持卡
One task is to change raw data into standard SDTM variable, such as if CPEVENT=”Treatment and Observation Period (Day1)” then VISIT=“Day 1”, or if CPEVENT=”Day 1” then VISITNUM=2001. Another commom task is value conversion between stan...
BYprocesses data and orders output according to the values of a classification (BY) variable.The BY statement in SAS/GRAPH is essentially the same as the BY statement in Base SAS, but the effect on the output is different when it is used with SAS/GRAPH procedures.When used with SAS/GRAPH...
数据集的每一行叫做一个观测(Observation),每列叫做一个变量(Variable)。SAS数据集等价于关系数据库系统中的一个表。 2...单击新建逻辑库按步骤填写。...','上海') 逻辑运算符:&(AND) l (OR) ^(NOT) 连接两个字符串的l l(两个连续的l号)取两个运算值中较大一个的(比如3 5结果为5),取两个运...
一行为一个观测单位(observation)、一列为一个变量(variable) 4.DATA步的内置循环 DATA 步有一个底层结构,即隐含的内置循环。你不必通知 SAS 去执行这个循环,SAS 会自动执行它。 DATA 步逐行执行语句、逐条处理观测 SAS 读取第一条观测,然后针对它从头到尾运行 DATA 步(当然是逐行运行),然后以同样的方式接着处...
var: select specific variable as the column noobs: similar to index, remove the index column Identify Observations IDvariables :会remove前面的observation 数,换成variable Select Obeservations method1:where[只有where才可以与contains连用,if不可以] ...
Adjust the prediction cutoff to label an observation as event or non-event. Support holdout data (training and validation) for model assessment. Generalized linear models: Distributions supported include beta, normal, binary, exponential, gamma, geometric, Poisson, Tweedie, inverse Gaussian and ...
PROC SORT compares allBY-variablevalues for each observation to those for theprevious observationthat was written to the output data set PROCSORT DATA=SAS-data-set-name NODUPKEY; 4.2:Using theNODUPRECS /nodupOption the NODUPRECS option comparesall of the variable valuesfor each observation to...
The MODIFY and SET statement option CUROBS creates and names a variable that contains the observation number that was just read from the data set. A new option, KEYRESET, controls whether a KEY= search should begin at the top of the index for the data set that is being read. The ...
This option tells SAS what on what line you want it to start reading your raw data file. If the first record(s) contains header information such as variable names, then set firstobs=n where n is the record number where the data actually begin. For example, if you are reading a comma ...