26013 - Carry non-missing values down a BY-Group

Sample 26013: Carry non-missing values down a BY-Group

/* Create sample data */

data one;
  input id $ x;
datalines;
a 1
a .
a 2
a 3
a .
a .
b .
b 2
b .
b 4
;

data two;
  drop temp;
  set one;
  by id;
  
  /* RETAIN the new variable */
  retain temp; 

  /* Reset TEMP when the BY-Group changes */
  if first.id then temp=.;

  /* Assign TEMP when X is non-missing */
  if x ne . then temp=x;

  /* When X is missing, assign the retained value of TEMP into X */
  else if x=. then x=temp;
run;

proc print data=one;
  title 'Before';
run;

proc print data=two;
  title 'After';
run;

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Before                                              

Obs    id     x

  1    a      1
  2    a      .
  3    a      2
  4    a      3
  5    a      .
  6    a      .
  7    b      .
  8    b      2
  9    b      .
 10    b      4

After                                                       

Obs    id    x

  1    a     1
  2    a     1
  3    a     2
  4    a     3
  5    a     3
  6    a     3
  7    b     .
  8    b     2
  9    b     2
 10    b     4

Type:	Sample
Topic:	SAS Reference ==> DATA Step Data Management ==> Manipulation and Transformation ==> BY-group processing

Date Modified:	2007-11-14 09:49:07
Date Created:	2006-01-27 15:24:13

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

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Sample 26013: Carry non-missing values down a BY-Group

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