Non-parametric Analysis with PROC NPAR1WAY

The script begins by creating a dataset named 'Gossypol' via a DATA STEP, using data embedded directly in the script ('datalines'). This dataset contains the variables 'Dose' and 'Gain'. Subsequently, the PROC NPAR1WAY procedure is called three times for different analyses:
1. The first execution performs a general non-parametric analysis to compare 'Gain' based on 'Dose'.
2. The second execution, framed by 'ods graphics on' and 'ods graphics off', generates a box plot of Wilcoxon scores to visualize distributions.
3. The third execution of PROC NPAR1WAY performs a two-sample analysis, applying a 'where Dose <= .04' clause to filter the data and focus on a specific subset. The entire script is designed to demonstrate various applications of PROC NPAR1WAY in experimental data analysis.

Data Analysis

Type : CREATION_INTERNE

The data is created directly within the SAS script via a DATA STEP using the 'datalines' feature to define observations for the 'Dose' and 'Gain' variables.

1 Code Block

DATA STEP Data

Explanation :
This DATA STEP block creates the 'Gossypol' dataset. It first reads a 'Dose' and a number 'n' of observations. Then, a loop reads 'n' 'Gain' values for each 'Dose', assigns them, and writes them to the dataset. The data is provided directly in the script via the 'datalines' section.

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1	DATA Gossypol;
2	INPUT Dose n;
3	DO i=1 to n;
4	INPUT Gain;
5	OUTPUT;
6	END;
7	DATALINES;
8	0 16
9	228 229 218 216 224 208 235 229 233 219 224 220 232 200 208 232
10	.04 11
11	186 229 220 208 228 198 222 273 216 198 213
12	.07 12
13	179 193 183 180 143 204 114 188 178 134 208 196
14	.10 17
15	130 87 135 116 118 165 151 59 126 64 78 94 150 160 122 110 178
16	.13 11
17	154 130 130 118 118 104 112 134 98 100 104
18	;

2 Code Block

PROC NPAR1WAY

Explanation :
This PROC NPAR1WAY performs a one-way non-parametric analysis. It compares the distribution of the 'Gain' variable among the different groups defined by the 'Dose' variable in the 'Gossypol' dataset.

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1	PROC NPAR1WAY DATA=Gossypol;
2	class Dose;
3	var Gain;
4	RUN;

3 Code Block

PROC NPAR1WAY

Explanation :
This block uses PROC NPAR1WAY to generate a box plot specific to Wilcoxon scores. The 'ods graphics on' and 'ods graphics off' statements enable and disable the graphical output of the Output Delivery System (ODS).

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1	ods graphics on;
2	PROC NPAR1WAY DATA=Gossypol plots(only)=wilcoxonboxplot;
3	class Dose;
4	var Gain;
5	RUN;
6	ods graphics off;

4 Code Block

PROC NPAR1WAY

Explanation :
This PROC NPAR1WAY performs a non-parametric analysis on a subset of the 'Gossypol' data. The 'where Dose <= .04' clause filters observations, including only those where the 'Dose' value is less than or equal to 0.04, allowing a targeted analysis on these groups.

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1	PROC NPAR1WAY DATA=Gossypol;
2	where Dose <= .04;
3	class Dose;
4	var Gain;
5	RUN;

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