在已知地层的SAS中创建分层样本

Question

我有一些具有某些特征的目标人群，并且我被要求根据这些特征选择适当的控制。我正在尝试使用SAS base做分层样本，但我需要能够从我的目标中定义我的4个starta％s，并将这些应用于我的样本。有什么办法可以做到吗？谢谢！

Answer 1

要做到分层抽样，您可以使用PROC SURVEYSELECT

Here is an example:- 

/*Dataset creation*/ 

data data_dummy; 
input revenue revenue_tag Premiership_level; 
    datalines; 
1000 High 1 
90 Low 2 
500 Medium 3 
1200 High 4 
; 
run; 


/*Now you need to Sort by rev_tag, Premiership_level (say these are the 
variables you need to do stratified sampling on)*/ 
proc sort data = data_dummy; 
by rev_tag Premiership_level; 
run; 



/*Now use SURVEYSELECT to do stratified sampling using 10% samprate (You can 
change this 10% as per your requirement)*/ 

/*Surveyselect is used to pick entries for groups such that , both the 
    groups created are similar in terms of variables specified under strata*/ 

    proc surveyselect data=data_dummy method = srs samprate=0.10 
    seed=12345 out=data_control; 
    strata rev_tag Premiership_level; 
    run; 

/*Finally tag (if you want for more clarity) your 10% data as control 
group*/ 
    Data data_control; 
    Set data_control; 
    Group = "Control"; 
    Run; 

希望这有助于:-)