This tutorial explains how to use PROC FREQ.
Create a sample data set
data example1;
input x y $ z;
cards;
6A60
6A70
2A100
2B10
3B67
2C81
3C63
5C55
;
run;
Example 1 : To check the distribution of a categorical variable (Character)
proc freq data = example1;The TABLES statements tells SAS to return one-way to n-way frequency and crosstabulation tables and computes the statistics for these tables.
tables y;
run;
 |
| Output : PROC FREQ |
Example 2 : To remove unwanted statistics in the table
proc freq data = example1;
tables y /nocum;
run;
If you want only frequency, not percent distribution and cumulative statistics.
proc freq data = example1;
tables y /nopercent nocum;
run;
Example 3 : Cross Tabulation ( 2*2 Table)
proc freq data = example1;
tables y * x;
run;
Example 4 : Hide Unwanted Statistics in Cross Tabulation
proc freq data = example1;
tables y * x / norow nocol nopercent;
run;
Example 5 : Request Multiple Tables
Example 6 : Use WEIGHT Statement
The WEIGHT statement is used when we already have the counts.
proc freq data = example1;
tables y * (x z) / norow nocol nopercent;
run;
The tables y*(x z) statement is equivalent to tables y*x y*z statement.Example - tables (a b)*(c d); is equivalent to tables a*c b*c a*d b*d;
Example 6 : Use WEIGHT Statement
Data example2;Example 7 : Store result in a data file
input pre $ post $ count;
cards;
Yes Yes 30
Yes No 10
No Yes 40
No No 20
;
run;
proc freq data=example2;
tables pre*post;
weight count;run;
proc freq data = example1;The OUT option is used to store result in a data file.
tables y *x / out = temp;
run;
Example 8 : Run Chi-Square Analysis
proc freq data = example1 noprint;
tables y * x/chisq;
output All out=temp_chi chisq;
run;