Example 4 for PROC CATMOD
/****************************************************************/
/* S A S S A M P L E L I B R A R Y */
/* */
/* NAME: CATEX4 */
/* TITLE: Example 4 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: */
/* */
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/*----------------------------------------------------------------
Example 4: Log-Linear Model, Three Dependent Variables
Bartlett's Data
---------------
Cuttings of two different lengths were planted at one of two
time points, and their survival status was recorded. The
variables are
v1=survival status (dead or alive)
v2=time of planting (spring or at_once)
v3=length of cutting (long or short).
From: Bishop, Fienberg, and Holland (1975, 89)
----------------------------------------------------------------*/
data bartlett;
input Length Time Status wt @@;
datalines;
1 1 1 156 1 1 2 84 1 2 1 84 1 2 2 156
2 1 1 107 2 1 2 133 2 2 1 31 2 2 2 209
;
title 'Bartlett''s Data';
proc catmod data=bartlett;
weight wt;
model Length*Time*Status=_response_
/ noparm pred=freq;
loglin Length|Time|Status @ 2;
title2 'Model with No 3-Variable Interaction';
quit;