Sample Size for Paired t Test


Menu location: Analysis_Sample Size_Paired t.


This function gives you the minimum number of pairs of subjects needed to detect a true difference DELTA in population means with power POWER and two sided type I error probability ALPHA (Dupont, 1990; Pearson and Hartley, 1970).


Information required


Practical issues


Technical validation

The estimated sample size n is calculated as the solution of:

- where d = delta/sd, α = alpha, β = 1 - power and tv,p is a Student t quantile with v degrees of freedom and probability p. n is rounded up to the closest integer.



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