Lab
Fall Biostatistics 2011
Richard Wanjohi
Biostatistics
Science of collecting
analyzing
and interpreting data
Paper and Pencil
Use statistical
software
using statistical theory and methods to
address problems in the biological and
health sciences
Data
variables
Name
Age
Gender
Location
status
Blood
pressure
John
34
Male
Fayetteville
single
121
Lisa
22
Female
Rogers
divorced
189
Petero
56
Female
Springdale
Married
199
Lebronjones 26
Male
Fayetteville
Single
145
Wade
Male
Bentonville
Divorced
200
89
Introduction to SAS
SAS- Statistical Analysis Software
one of most advanced statistical programming
packages currently available.
Other software- R, Matlab, JMP, S-plus, SPSS,
Maple, etc
Overview of SAS
SAS uses three windows to display
information:
I. The EDITOR window (also called the Program
window) which contains the SAS program code.
II. The LOG window which displays the SAS
execution notes, statements, error messages,
etc.
III. The OUTPUT window which displays the results
of the statistical analysis.
Components of SAS program
basic SAS program is made up of:
i. The Data Step which contains variable
names and labels,
ii. The Raw Data Section or the actual
observations which are to be considered for
analysis, and
iii. The Procedure Section which contains the
call statements for the appropriate statistical
analysis
SAS program code: example one
Data one;
input Age;
datalines;
data step
Raw data section
21
19
16
23
45
;
run;
proc print data = one;
run; quit;
procedure section
Example Two
data two;
input Age weight;
datalines;
21 120
19 160
16 155
23 489
45 132
;
run;
proc print data = two;
run; quit;
Example Three
data three;
input Name Age weight;
datalines;
John 21 120
Mike 19 160
Lisa 16 155
Ray 23 489
Lebronjones 45 132
Kobes
88
204
;
run;
proc print data = three;
run; quit;