sas - SAS: do loop help: variable =1 from start of by group until marker =1

Question

In SAS, I have data that is sorted by time. For the first n minutes, a marker variable is marked 0 then changes to 1. This occurs within a 'by' variable. I want to create a new variable that =1 for each minute from the start of the 'by' group observations until the marker variable gets to 1. I have tried dozens of do loop combinations and have been unsuccessful. Any help would be appreciated!

Answer 1

从这样的数据集中：

by_var marker
A      0
A      0
A      1
B      0
B      0
B      1

你可以得到一个看起来像这样的数据集（如果每个观察都是一分钟）：

by_var marker minute
A      0      1
A      0      2
A      1      3
B      0      1
B      0      2
B      1      3

通过排序by_var并使用简单的data步骤从您的数据集中：

data my_data2;
  set my_data;
  by by_var;
  if first.by_var then minute = 0;
  minute+1;
  output;
run;

或者您是否需要更改这样的内容（使用时间变量）：

by_var marker time
A      0      12:34:01
A      0      12:34:59
A      0      12:35:01
A      0      12:36:12
A      1      12:36:50
B      0      12:34:01
B      0      12:34:09
B      0      12:34:59
B      0      12:36:12
B      1      12:37:50

对此：

by_var    marker      time         time2    minutes    Cumsum_minutes

  A          0      12:34:01           .       0           0
  A          0      12:34:59    12:34:01       0           0
  A          0      12:35:01    12:34:59       1           1
  A          0      12:36:12    12:35:01       1           2
  A          1      12:36:50    12:36:12       0           2
  B          0      12:34:01    12:36:50       0           0
  B          0      12:34:09    12:34:01       0           0
  B          0      12:34:59    12:34:09       0           0
  B          0      12:36:12    12:34:59       2           2
  B          1      12:37:50    12:36:12       1           3

代码：

data my_data;
  input by_var $ marker time time.;
  format time time.;
  cards;
  A 0 12:34:01
  A 0 12:34:59
  A 0 12:35:01
  A 0 12:36:12
  A 1 12:36:50
  B 0 12:34:01
  B 0 12:34:09
  B 0 12:34:59
  B 0 12:36:12
  B 1 12:37:50
  ;
run;

proc sort data=my_data;by by_var;run;

data final;
  set my_data;
  format time2 time.;
  by by_var;
  time2=lag(time);
  if first.by_var then do;
    minutes = 0;
    Cumsum_minutes = 0;
  end;
  else minutes=intck("minutes",time2,time);
  Cumsum_minutes+minutes;
run;