![]() ![]() Most universities with statistics departments or statistics programs also offer a consulting service. If you need statistical advice on your research problem, you should contact a statistical consultant and if you want expert advice, you should expect to pay for it. I need consulting help I am providing this software for free, but that does not obligate me to also answer substantive questions on power/sample size for your research project. Nothing has really changed here in a number of years, except for making the website more consistent with what’s happened to Java. Also, this is getting to be pretty old software. However, each applet has a help menu, and I do request that you carefully read that before you e-mail me with questions. I need help on using a particular applet I am willing to provide minimal support if you truly don’t understand what inputs are required. There are usually not nice neat formulas. Sample sizes are calculated using root-finding methods in conjunction with power calculations. In a few cases, an approximation is used, and is labeled as such. ![]() Typically it is a probability associated with a non-central distribution. What formula(s) do you use in these calculations? In most cases, power is an exact calculation based on the distributional situation in question. ![]()
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