One and Two-Way Frequency Tables Using PROC FREQ

One and Two-Way Frequency Tables Using PROC FREQ PowerPoint PPT Presentation


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The FREQ Procedure. FREQ is used to construct frequency tables (count/percentage) for variables in a data set.Tables may include from one to three variablesFREQ can also produce tests for independence/association.. The FREQ Procedure. General Syntax:PROC FREQ < options > ; BY variables ; EXACT

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One and Two-Way Frequency Tables Using PROC FREQ

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1. One and Two-Way Frequency Tables Using PROC FREQ STT 305

2. The FREQ Procedure FREQ is used to construct frequency tables (count/percentage) for variables in a data set. Tables may include from one to three variables FREQ can also produce tests for independence/association.

3. The FREQ Procedure General Syntax: PROC FREQ < options > ; BY variables ; EXACT statistic-options < / computation-options > ; OUTPUT < OUT=SAS-data-set > options ; TABLES requests < / options > ; TEST options ; WEIGHT variable < / option > ; No var or class statement.

4. The FREQ Procedure Default behavior… proc freq data=stt305.fish; run; is to give a frequency table for every variable in the data set. Each variable is taken as a classification variable, i.e. each distinct value is taken as a separate category.

5. The Table Statement The table statement is like the var statement in that it selects variables for analysis; however, it will also affect the structure of the table(s). This case: proc freq data=stt305.fish; table lt dam; run;

6. The Table Statement Produces a table for both dam and lake type:

7. Using Formats Formats are recognized for any variable listed in the table statement. Using these formats: proc format; value lake 1='Oligotrophic' 2='Eutrophic' 3='Mesotrophic' ; value dam 1='Yes' 0='No' ; value safety low-<0.5='Safe' 0.5-<1.0='Unsafe' 1.0-high='Dangerous' ; run;

8. Using Formats With this code: proc freq data=stt305.fish; table lt dam hg; format lt lake. dam dam. hg safety.; run; Produces:

9. Two-Way tables The * operator can be used in the table statement to create a two dimensional table. Consider: proc freq data=stt305.fish; table lt*hg; format lt lake. hg safety.; run;

10. Two-Way tables

11. Two-Way tables

12. Two-Way tables

13. Two-Way tables

14. Three-Way Tables Consider proc freq data=stt305.fish; table dam*lt*hg; format lt lake. dam dam. hg safety.; run; Creates the two-way table for lake type and mercury for each level of dam (no & yes).

15. Three-Way Tables

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