CSULB_STAT475_handout11

CSULB_STAT475_handout11 - STAT 475 Chapter 9 PRODUCING...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: STAT 475 Chapter 9 PRODUCING FREQUENCY TABLES The PROC FREQ may be used to create a one-way frequency table that reports the number (frequency) of observations for each value of a categorical variable. That is, the one-way frequency table contains the frequency distribution . By default, the PROC FREQ reports frequency count , percentage , cumulative frequency , and cumulative percentage for each value of a variable. Example. Ten people were treated for glaucoma. Their sex, race, and response to the treatment (yes or no) were recorded. The following code produces a one-way frequency table for the three categorical variables in the data set. data glaucoma; input Sex $ Race $ Response $ @@; datalines; female white yes male white yes male black no male hispanic no female hispanic yes male white yes male black yes male white no female black yes female white no ; proc freq; run; The output is The FREQ Procedure Cumulative Cumulative Sex Frequency Percent Frequency Percent female 4 40.00 4 40.00 male 6 60.00 10 100.00 Cumulative Cumulative Race Frequency Percent Frequency Percent black 3 30.00 3 30.00 hispanic 2 20.00 5 50.00 white 5 50.00 10 100.00 Cumulative Cumulative Response Frequency Percent Frequency Percent no 4 40.00 4 40.00 yes 6 60.00 10 100.00 To specify the variables to be processed by the FREQ procedure, use the TABLES statement. The syntax is 1 proc freq; tables variable1 variable2 ; run; Example. In the glaucoma example, to compute the frequency distribution for Sex and Response only, use the following code proc freq ; tables Sex Response; run ; The output is The FREQ Procedure Cumulative Cumulative Sex Frequency Percent Frequency Percent female 4 40.00 4 40.00 male 6 60.00 10 100.00 Cumulative Cumulative Response Frequency Percent Frequency Percent...
View Full Document

Page1 / 7

CSULB_STAT475_handout11 - STAT 475 Chapter 9 PRODUCING...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online