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The'following'example'is'better:'
data temp;
input group x;
cards;
1 23
1 34
1 .
1 45
2 78
2 92
2 45
2 89
2 34
2 76
3 31
4 23
4 12
;
run;
/**************************************************
The automatic variables first.group and last.group
are not saved with the data set. Here we write them
to data set variables to show their contents.
**************************************************/
data new;
set temp;
by group;
first=first.group;
last=last.group;
run;
proc print;
title 'Raw data along with first.group and last.group';
run;
/**************************************************
A common task in data cleaning is to identify
observations with a duplicate ID number. If we set
the data set by ID, then the observations which
are not duplicated will be both the first and the
last with that ID number. We can therefore write
any observations which are not both first.id and
last.id to a separate data set and examine them.
**************************************************/
data single dup;
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