| pairt | R Documentation | 
Compute power for a Paired t-test Takes means, sd, and sample sizes. Alpha is .05 by default, alternative values may be entered by user. correlation (r) defaults to .50.
pairt(m1 = NULL, m2 = NULL, s = NULL, n = NULL, r = NULL, alpha = 0.05)
| m1 | Mean for Pre Test | 
| m2 | Mean for Post Test | 
| s | Standard deviation | 
| n | Sample size | 
| r | Correlation pre-post measures (default is .50) | 
| alpha | Type I error (default is .05) | 
Power for the Paired t-test
pairt(m1=25,m2=20, s = 5, n = 25, r = .5)
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