Question

ESN是一个id列，每个esn有多个观察值，因此会出现重复的esn值。对于给定的esn，我想找到最早的服务开始日期（并先调用它），我想找到正确的结束日期（称为last）if / then语句，如何选择“last”是正确的，但是运行以下代码时出现以下错误：

340        first = min(of start(*));
               ---
               71
ERROR 71-185: The MIN function call does not have enough arguments.

这是我使用的代码

data three_1; /*first and last date created ?? used to ignore ? in data*/
set three;
format first  MMDDYY10. last  MMDDYY10.;
by esn;
array start(*)  service_start_date;
array stop(*) service_end_date entry_date_est ;
do i=1 to dim(start);
  first = min(of start(*));
end;
do i=1 to dim(stop);
  if esn_status = 'Cancelled' then last = min(input(service_end_date, MMDDYY10.), input(entry_date_est, MMDDYY10.));
  else last = max(input(service_end_date, MMDDYY10.), input(entry_date_est, MMDDYY10.));
end;
run;

“esn”“service_start_date”“service_end_date”“entry_date_est”“esn_status”

1 10/12/2010 01/01/2100 10/12/2012取消

1 05/02/2009 02/12/2010 10/09/2012取消

1 04/05/2011 03/04/2100 10/02/2012取消

结果应首先= 05/02/2009，最后= 10/12/2012

Answer 1

数组和min（），max（）等函数在数据集的各行之间水平操作，而不是跨多个记录垂直操作。

假设esn_status对于给定的esn是常量，那么您需要通过esn和service_start_date对输入进行排序。您可以使用数据步骤来收集所需的值。

data three; /*thanks Joe for the data step to create the example data*/
length esn_status $10;
format service_start_date service_end_date entry_date_est MMDDYY10.;
input esn (service_start_date service_end_date entry_date_est) (:mmddyy10.) esn_status $;
datalines;
1 10/12/2010 01/01/2100 10/12/2012 cancelled
1 05/02/2009 02/12/2010 10/09/2012 cancelled
1 04/05/2011 03/04/2100 10/02/2012 cancelled
;;;;
run;

proc sort data=three;
by esn service_start_date;
run;

data three_1(keep=esn esn_status start last);
set three;
format start last date9.;
by esn;
retain start last;
if first.esn then do;
    start = service_start_date;
    last = service_end_date;
end;

if esn_status = "cancelled" then
    last = min(last,service_end_date,entry_date_est);
else
    last = max(last,service_end_date,entry_date_est);

if last.esn then
    output; 
run;

Answer 2

DoW循环将到达您想要的位置，或者您可以在SQL中执行此操作。据我所知，您所需的结果与实际结果不符，因此您可能需要进行一些调整。你需要为未被取消的人提供第二个WANT数据集，我认为没有一种简单的方法可以将它放在一个数据步骤中。

data have;
length esn_status $10;
format service_start_date service_end_date entry_date_est MMDDYY10.;
input esn (service_start_date service_end_date entry_date_est) (:mmddyy10.) esn_status $;
datalines;
1 10/12/2010 01/01/2100 10/12/2012 cancelled
1 05/02/2009 02/12/2010 10/09/2012 cancelled
1 04/05/2011 03/04/2100 10/02/2012 cancelled
;;;;
run;
data want_cancelled;
first = 99999;
last = 99999;
do _n_ = 1 by 1 until (last.esn);
 set have(where=(esn_status='cancelled'));
 by esn;
 first = min(first,service_start_date);
 last = min(last,service_end_date,entry_date_est);
end;
output;
keep first last esn;
format first last mmddyy10.;
run;

唯一身份证的最早开始日期

2 个答案: