Re: Extra Paramaters in "Sample Size & Power - K Means", what are they used for?
Sep 26, 2016 6:49 AM(1692 views)
I've used the Extra Parameters when I have a blocking situation, such as a Randomized Complete Block Design (RCBD). For instance, in your scenario, if you wanted to see the power when you have 32 runs, but it is run across 8 days, where day is your blocking factor, then you would enter 8 in the Extra Parameters box.
The power will be slightly lower, since you'll have fewer degrees of freedom for your error term. But if the RCBD reflects your situation, then it's always a good idea to match your sample size and power calculations with the type of analysis you'll use.