Chapter 3
SAS
- 1 -
Chapter 3
Graphs – All types
3.1
Histograms
To illustrate how to graph using SAS, let us consider the
grass
data set, and the following
is a description of the data set:
Three seed growth methods
are applied to seeds from each of
five varieties
of turf grass.
Six
pots are planted with seeds from each method by variety combination. The 90 pots are
randomly placed in a uniform growth chamber, and dry matter yields are measured from
clippings at the end of four weeks. The variables in the data set are
method
the growth method
variety
the variety of turf grass
yield
the amount of dried turf growth in each pot after four weeks.
1.
DATA STEP!
data
SASdata.grass;
input
method $ variety @;
do
i=
1
to
6
;
input
yield @;
output
;
end
;
datalines
;
A
1
22.1 24.1 19.1 22.1 25.1 18.1
A
2
29.1 17.1 21.6 28.6 17.1 26.6
A
3
25.3 25.8 22.8 28.3 21.3 18.3
A
4
19.8 28.3 26.8 27.3 26.8 26.8
A
5
18.0 15.0 22.0 20.5 26.0 20.5
B
1
13.5 14.5 11.5
6.0 27.0 18.0
B
2
18.9 19.4 12.4 21.4 15.9 17.4
B
3
16.7 10.2 16.7 19.7 18.2 12.2
B
4
15.1
6.5 17.1
7.6 13.6 21.1
B
5
19.8 20.8 16.8 19.3 14.3 12.3
C
1
19.0 22.0 20.0 14.5 19.0 16.0
C
2
22.0 24.0 27.5 18.5 20.0 19.5
C
3
16.4 14.4 21.4 19.9 12.4 21.4
C
4
24.5 16.0 11.0
7.5 14.5 15.5
C
5
10.8 12.3 18.3
6.3
5.8 10.8
;
title2
'List the first 40 observations from grass data set'
;
proc
print
data
= SASdata.grass (
obs
=
40
);
run
;

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