24666 - Creating the equivalent of the LEAD function by comparing the value of a variable to its value in the next observation

Sample 24666: Creating the equivalent of the LEAD function by comparing the value of a variable to its value in the next observation

/* Create sample data */

data one;
  input x y;
datalines;
5 1
5 2
10 1
2 1
2 2
19 1
;

/* Create TWO by merging ONE with itself.  Begin reading the second     */
/* reference to data set ONE with the second observation.  RENAME=      */
/* renames X so that the look-ahead value doesn't overwrite the current */
/* value of X in the program data vector.                               */

data two;
  merge one one(firstobs=2 rename=(x=nextx) keep=x);
  if x=nextx then match='YES';
  else match='NO';
run;

proc print data=TWO;
run;

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Obs     x    y    nextx    match

 1      5    1       5      YES
 2      5    2      10      NO
 3     10    1       2      NO
 4      2    1       2      YES
 5      2    2      19      NO
 6     19    1       .      NO

Type:	Sample
Topic:	SAS Reference ==> DATA Step SAS Reference ==> Functions ==> Special

Date Modified:	2020-04-20 12:18:42
Date Created:	2004-09-30 14:09:02

Product Family	Product	Host	SAS Release
			Starting	Ending
SAS System	Base SAS	All	n/a	n/a

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Sample 24666: Creating the equivalent of the LEAD function by comparing the value of a variable to its value in the next observation

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