Directions for using the calculator are listed below, along with more information about two sample t tests and help on which is appropriate for your analysis. There are several types of two sample t tests and this calculator focuses on the three most common: unpaired, welchs, and paired t tests. Michael Allwood (2008) "The Satterthwaite Formula for Degrees of Freedom in the Two-Sample t-Test", AP Statistics, Advanced Placement Program, The College Board. A t test compares the means of two groups.Neter, John John Neter William Wasserman Michael H. : CS1 maint: location missing publisher ( link) , n), each respectively having ν i degrees of freedom, often one computes the linear combination. In statistics and uncertainty analysis, the Welch–Satterthwaite equation is used to calculate an approximation to the effective degrees of freedom of a linear combination of independent sample variances, also known as the pooled degrees of freedom, corresponding to the pooled variance.įor n sample variances s i 2 ( i = 1. However, according to the Satterthwaite formula on page 2002 of the reference manual (3rd equation on the page) any combination of variance. You mention you can see no reason why even the Satterthwaite degrees of freedom should not be greater than (n1 + n2 - 2). Equation to approximate pooled degrees of freedom RE: st: Ttest and Welchs degrees of freedom.
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