The online Sample Size Calculator was developed and is maintained by Robin Ristl.
I am an academic researcher in statistical methodology and applied statistics based in Vienna, Austria. I prepared the online Sample Size Calculator to fit the needs of researchers such as myself in designing medical and other scientific studies. The calculator includes many advanced options, which I observed to be of use, such as accounting for drop-outs or planning for unequally sized groups.
Feedback on the calculator comes form resarchers around the world. I am confident it fits well to the needs of other applied statisticians and all researchers planning quantitive research.
If you require advice regarding your sample size planning, or if you have a question regarding underlying functions or how to use the calculator, get in contact with: robin.ristl@univie.ac.at
This is the online Sample Size Calculator version 1.061.
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