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Closest match

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New Contributor
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Closest match

[ Edited ]

Hello,

 

Say that I have a dataset1 with ID and variable 1, like this:

IDVar1
A5.1
B6.1
C7.1
D8.1
F9.1
G10.1

 

I also have dataset2, which is a reference table like this:

Var2Var3
520
630
740
850
960

 

How do I obtain a dataset that has ID, Var1, and Var3 such that Var3 corresponds to Var1's closest match in Var2 of the reference table. The resulting dataset would look like this:

IDVar1Var3
A5.120
B6.130
C7.140
D8.150
F9.160
G10.160

 

I came across the following article but I'm not sure how it can be adapted to my problem: http://www.lexjansen.com/pharmasug/2003/CodersCorner/cc001.pdf

 

Thank you.


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‎06-09-2017 11:45 AM
Regular Contributor
Posts: 233

Re: Closest match

Hello,

 

proc sql;
	CREATE TABLE want0 AS
	SELECT a.ID, a.VAR1, b.VAR2, b.VAR3, abs(b.VAR2-a.VAR1) AS DIFF, min(CALCULATED DIFF) AS MIN_DIFF
	FROM have1 a, have2 b
	GROUP BY a.ID
	HAVING CALCULATED DIFF=CALCULATED MIN_DIFF;
quit;

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Solution
‎06-09-2017 11:45 AM
Regular Contributor
Posts: 233

Re: Closest match

Hello,

 

proc sql;
	CREATE TABLE want0 AS
	SELECT a.ID, a.VAR1, b.VAR2, b.VAR3, abs(b.VAR2-a.VAR1) AS DIFF, min(CALCULATED DIFF) AS MIN_DIFF
	FROM have1 a, have2 b
	GROUP BY a.ID
	HAVING CALCULATED DIFF=CALCULATED MIN_DIFF;
quit;
Super User
Posts: 19,772

Re: Closest match

Have you tried the SQL solution in that paper? It's probably the easiest to implement if you're new to SAS.

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