Documentation Example 1 for PROC NPAR1WAY

The script begins by creating a dataset named 'Arthritis' using inline data (datalines) describing treatment effectiveness (Active or Placebo) and patient response. It then uses PROC NPAR1WAY to perform non-parametric statistical tests (Wilcoxon and median) on the 'Response' variable grouped by 'Treatment'. The ODS GRAPHICS option is enabled to generate Wilcoxon box plots and median plots, providing a visualization of the results.

Data Analysis

Type : CREATION_INTERNE

The 'Arthritis' dataset is created directly within the script via datalines instructions, providing observations on treatment, response, and frequency.

1 Code Block

DATA STEP Data

Explanation :
This DATA STEP block creates the 'Arthritis' dataset. It defines three variables: 'Treatment' (character), 'Response' (numeric), and 'Freq' (numeric). The data for these variables is provided directly in the script via the DATALINES statement. Each line after DATALINES represents an observation, with values corresponding to the defined variables.

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1	DATA Arthritis;
2	INPUT Treatment $ Response Freq;
3	DATALINES;
4	Active 5 5 Active 4 11 Active 3 5 Active 2 1 Active 1 5
5	Placebo 5 2 Placebo 4 4 Placebo 3 7 Placebo 2 7 Placebo 1 12
6	;

2 Code Block

PROC NPAR1WAY

Explanation :
This block executes PROC NPAR1WAY to perform a non-parametric analysis. The input dataset is 'Arthritis'. The 'wilcoxon' and 'median' options request the execution of Wilcoxon and median tests, respectively. The 'class Treatment;' statement specifies 'Treatment' as the classification variable, and 'var Response;' indicates that 'Response' is the variable to be analyzed. 'freq Freq;' uses the 'Freq' variable to weight observations. Activating ODS GRAPHICS allows for the generation of plots, including Wilcoxon box plots and median plots, for better visualization of the results.

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1	ods graphics on;
2	PROC NPAR1WAY DATA=Arthritis wilcoxon median
3	plots=(wilcoxonboxplot medianplot);
4	class Treatment;
5	var Response;
6	freq Freq;
7	RUN;
8	ods graphics off;

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Copyright Info : S A S S A M P L E L I B R A R Y NAME: NPAR1EX1 TITLE: Documentation Example 1 for PROC NPAR1WAY PRODUCT: STAT SYSTEM: ALL KEYS: nonparametric methods, categorical data analysis, KEYS: Wilcoxon test, Wilcoxon scores box plot, KEYS: median test, median plot PROCS: NPAR1WAY REF: PROC NPAR1WAY, Example 1

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