Student's t-test on simulated data

This script starts by creating a SAS^© table named QUES6_4 containing simulated data for three groups (A, B, C) with randomly generated numerical variables X and Y. Then, a TTEST procedure is used to compare the means of variables X and Y specifically between groups A and C.

Data Analysis

Type : CREATION_INTERNE

The data is entirely generated in the DATA step using DO loops and random number functions (RANNOR, RANUNI).

1 Code Block

DATA STEP Data

Explanation :
Creation of the QUES6_4 table. Nested loops are used to generate 10 observations for each of groups A, B, and C. Variables X and Y are calculated using random functions (normal distribution and uniform distribution).

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1	DATA QUES6_4;
2	DO GROUP = 'A','B','C';
3	DO I = 1 TO 10;
4	X = ROUND(RANNOR(135)*10 + 300 +
5	5(GROUP EQ 'A') - 7(GROUP EQ 'C'));
6	Y = ROUND(RANUNI(135)*100 + X);
7	OUTPUT;
8	END;
9	END;
10	DROP I;
11	RUN;

2 Code Block

PROC TTEST

Explanation :
Execution of a Student's t-test to compare means. The WHERE clause filters the data to retain only groups A and C. The CLASS statement defines the grouping variable, and VAR specifies the variables to be analyzed.

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1	PROC TTEST;
2	title 'Problem 6.4';
3	where GROUP in ('A' 'C');
4	class GROUP;
5	var X Y;
6	RUN;

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