SAS：我如何测试一个值的稳定性

Question

我有这个数据库：

data temp;
input ID monitoring_date score ;
  datalines;
 1 10/11/2006   0      
 1 10/12/2006   0      
 1 15/01/2007   1      
 1 20/01/2007   1
 1 20/04/2007   1

 2 10/08/2008   0        
 2 11/09/2008   0        
 2 17/10/2008   1        
 2 12/11/2008   0 

 3 10/12/2008   0 
 3 10/08/2008   0        
 3 11/09/2008   0        
 3 17/10/2009   1        
 3 12/12/2009   1    
 3 05/01/2010   0  

 4 10/12/2006   0 
 4 10/08/2006   0        
 4 11/09/2006   0        
 4 17/10/2007   0        
 4 12/12/2007   0    
 4 09/04/2008   1  
 4 05/08/2008   1

 5 10/12/2013   0 
 5 03/09/2013   0        
 5 11/09/2013   0        
 5 19/10/2014   0        
 5 10/12/2014   1    
 5 14/01/2015   1  

 6 10/12/2017   0 
 6 10/08/2018   0        
 6 11/09/2018   0        
 6 17/10/2018   1        
 6 12/12/2018   1    
 6 09/04/2019   1  
 6 25/07/2019   0
 6 05/08/2019   1
 6 15/09/2019   0
 ;

我想创建一个新数据库，其中包含一个新列，我在其中记录每个 ID 分数从 0 到 1 的第一次进展的日期，如果此进展至少稳定 3 个月，直到监控结束 else date_progresion = . :

data want;
input ID   date_progression;
  datalines;
 1            15/01/2007
 2            .
 3            .
 4            09/04/2008
 5            .
 6            .
 ;

我真的不知道要对此进行编码，我想获得所需的数据来生成一个 cox 模型，其中进展 (Yes/No) 是我的事件。我真的卡住了！

提前感谢您的帮助！

Answer 1

一个 DOW 循环可以处理 ID 个组，跟踪 1s 的单个活动 运行。运行有开始日期和持续时间。

示例：

data want; do _n_ = 1 by 1 until (last.id); set have; by id; select; when (pscore = 0 and score = 1) do; state = 1; start = date; dur = 1; end; when (pscore = 1 and score = 1) do; state = 2; dur + 1; end; when (pscore = 1 and score = 0) do; state = 3; start = .; dur = .; end; when (pscore = 0 and score = 0) do; state = 4; end; otherwise; end; pscore = score; end; if state = 2 and dur >= 3 then progression_date = start; keep ID progression_date; format progression_date yymmdd10.; run;

SAS：我如何测试一个值的稳定性

SAS: How can I test the stability of a value among time

sas

stability