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'Life is after all a recursive summation, indeed

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Grouped, Two Sample t-Test

SAS Source: TTEST1.SAS

Description

Performs a two sample t-test for testing a hypothesis that the means of two observations are equal.

Undelying assumption for this TTEST procedure is that the observations are random samples drawn from two independent and normally distributed populations with an equal variance.

If these assumptions could not be satisfied or ascertained, you *should* use Nonparametric statistics techniques instead for testing your hypothesis. (see NPAR1WAY procedure)

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OPTIONS LINESIZE=70;
TITLE1 'A Two Sample t-Test';
DATA T_Scores;
/* @@ means a loop in reading input variable sequence */
  INPUT Gender $ Score @@;
  CARDS;
F 75  F 76  F 80  F 77  F 80  F 77  F 73
M 82  M 80  M 85  M 85  M 78  M 87  M 82
;
RUN;

/* CLASS = name of the grouping variable         */
/* VAR   = name of the variable whose means to   */
/*         be compared                           */
PROC TTEST DATA=T_Scores;
  CLASS Gender;
  VAR Score;
RUN;

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SAS User Guide (SUG) for Procedures (PROC) used in the Source

TTEST procedure

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