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|See also: tDistriQuantile, tDistriIntegral, TtTestVersion, PerformMannWhitneyUTest, PerformFTest, Perform1SampleTTest, PerformSiegelTukeyTest
The function Perform2SampleTTest returns the probability associated with a 2-sample t-test (probability which indicates the likelihood that two samples have come from the same two underlying populations having the same mean). It is available in three overloaded versions: version  mimics the function TTEST of Microsofts Excel, versions  and  return a lot more details of the t-test calculation.
The parameters Data1 and Data2 contain the data as a TVector. Note that the number of elements of the two vectors have to be equal if a paired t-test is to be performed. The parameter TestType determines the type of t-test to be performed. The parameter OneSided has to be TRUE for one-sided tests, or FALSE for two-sided tests.
Versions  and  of the function return additional parameters obtained during the t-test calculation: