Example 2 for PROC CATMOD
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/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: CATEX2 */
/* TITLE: Example 2 for PROC CATMOD */
/* PRODUCT: STAT */
/* SYSTEM: ALL */
/* KEYS: categorical data analysis */
/* PROCS: CATMOD */
/* DATA: */
/* */
/* SUPPORT: Bob Derr */
/* REF: SAS/STAT User's Guide, PROC CATMOD chapter */
/* MISC: */
/* */
/****************************************************************/
/*----------------------------------------------------------------
Example 2: Mean Score Response Function, r=3 Responses
Dumping Syndrome Data
---------------------
Four surgical operations for duodenal ulcers were compared
in a clinical trial at four hospitals. The response was the
severity of an undesirable complication called dumping
syndrome. The operations were
a. drainage and vagotomy
b. 25% resection and vagotomy
c. 50% resection and vagotomy
d. 75% resection
From: Grizzle, Starmer, and Koch (1969, 489-504).
----------------------------------------------------------------*/
data operate;
input Hospital Treatment $ Severity $ wt @@;
datalines;
1 a none 23 1 a slight 7 1 a moderate 2
1 b none 23 1 b slight 10 1 b moderate 5
1 c none 20 1 c slight 13 1 c moderate 5
1 d none 24 1 d slight 10 1 d moderate 6
2 a none 18 2 a slight 6 2 a moderate 1
2 b none 18 2 b slight 6 2 b moderate 2
2 c none 13 2 c slight 13 2 c moderate 2
2 d none 9 2 d slight 15 2 d moderate 2
3 a none 8 3 a slight 6 3 a moderate 3
3 b none 12 3 b slight 4 3 b moderate 4
3 c none 11 3 c slight 6 3 c moderate 2
3 d none 7 3 d slight 7 3 d moderate 4
4 a none 12 4 a slight 9 4 a moderate 1
4 b none 15 4 b slight 3 4 b moderate 2
4 c none 14 4 c slight 8 4 c moderate 3
4 d none 13 4 d slight 6 4 d moderate 4
;
title 'Dumping Syndrome Data';
proc catmod data=operate order=data ;
weight wt;
response 0 0.5 1;
model Severity=Treatment Hospital / freq oneway design;
title2 'Main-Effects Model';
quit;