Example 28.3 Examining Multiple BY Groups

This example illustrates how a time ID variable can be examined independently over each BY group and summarized over all observations in the DATA= data set.

data bygroups;
   format tid date.;
   input tid : date. by @@;
datalines;

   ... more lines ...   

The following TIMEID procedure statements generate two data sets that summarize a data set with four BY groups.

proc timeid data=bygroups outintervaldetails=int outinterval=intsum;
   id tid;
   by by;
run;

The summarized information in Output 28.3.1 shows that BY groups 2, 3, and 4 in the ByGroups data set contain some duplicate values and spans, and group 1 conforms exactly to the WEEKDAY17W interval. This listing also shows that the date ranges in these two BY groups start and end on different days and that they overlap between December 7, 2009, and December 28, 2009.