Power - Independent Samples t-test

Notes and Considerations

See "NOTES Indep Samples t-test Sample Size Derivation.pdf" attached.

Data Set

Analysis or Script File

Examples using Statistica

• Cephas Latex MEC Sample Size.doc (attached)

• Cephas Sample Size.stw (attached)

Example Using R software

library(TeachingDemos)

?TeachingDemos

?power.examp

#-------------------------

# one interactive graphical demo

#-------------------------

power.examp(n = 1, stdev = 1, diff = 1, alpha = 0.05, xmin = -2, xmax = 4)

run.power.examp.old()

#-------------------------

#-------------------------

# another interactive graphical demo

#-------------------------

run.power.examp(hscale=1.5, vscale=1.5, wait=FALSE)

#-------------------------

library(TeachingDemos)

power.t.test