*
chapter_14_table_4

For the hypothetical data contained in Table 14.1, a perceptual 
psychologist studying the visual system was interested in determining 
the extent to which interfering visual stimuli slow the ability to 
recognize letters. Participants are brought into a laboratory where 
they are seated in front of a tachistoscope. Variations in the 
presentations of letters is examined with interest being on the reaction 
time for target letters presented either in the center of the screen or 
off centered with and without "noise" accompanying the target letters. 


To perform the repeated measures analysis, PROC GLM is used. The 
analysis begins by specifying the six dependent variables on the 
left side of the equals sign. Note that angle is 'changing faster' 
than noise. Specifically the first three dependent variables entered
are all noise absent, with the first being angle=0 the second angle=4
and the third angle=8. In this sense we say that angle is 'changing
fastest.' Because angle is 'changing fastest,' it is included 
second on the REPEATED LINE (implying that because noise is 
'changing slowest,' it is included first on the REPEATED line).
As usual we have included / NOUNI on the model line. This tells
SAS that we do not want it to perform univariate tests for
each of the six dependent variables.
;

LIBNAME md 'd:\data files by type\sas data files\tables';
     Data c14t1;
       SET md.chapter_14_table_4;
PROC GLM;
MODEL abs0 abs4 abs8 pres0 pres4 pres8 = / NOUNI;
REPEATED noise 2, angle 3;
RUN;