So I'm starting a website (see thread title) devoted to statistical power analysis and sample size determination. Why? B/c I make power/sample size calculations all the time in my work. Sometimes a common statistical test will do; sometimes something a little more complex. But, invariably, the powers-that-be want me to give them numbers quick, and in rapid succession (try it with this value, no, now with this value ...) They also want my knowledge of all things power-sample-size to be rock solid.

I hear you. I know there's already a plethora of those online. But they've always turned out to be more of a headache to me than anything. Reason? They're all incomplete in one way or another -- underlying formula is unclear; too vague; limited inputs available; difficult to use; only does power or sample size, not both; etc...

As much as I love R -- and for me it is a better choice than the existing online calculators I've seen -- but all the packages I've seen still have similar issues as above. I considered writing up my own functions ... but if I code 'em in R, why not in javascript? Hence it began.

From my short time here it seems users of this site represent a wide range of statistical expertise/experience levels. I know what I need a power/sample size calculator to do, but that doesn't mean it's good for everybody. Keeping in mind it's a brand new site, any thoughts on the site? PowerAndSampleSize.com

I have a really cool system set up (details of which are probably more interesting for a computer science forum) so that I can add lots of calculators quickly; reason for that is, I plan to eventually have calculators for tons of statistical tests, any I'd ever conceivably need that I can code up to a webpage. I also intend to have enough clear articles there so that even I can remember the details of the calculations when need be, but I also want it to be accessible to a wide range of people, from a non-statistician graduate student, to a seasoned stat wrangler. Like it says on one of my pages, I (and we all) learn so much from the web, it'd be really cool to be able to help others, too.

I hear you. I know there's already a plethora of those online. But they've always turned out to be more of a headache to me than anything. Reason? They're all incomplete in one way or another -- underlying formula is unclear; too vague; limited inputs available; difficult to use; only does power or sample size, not both; etc...

As much as I love R -- and for me it is a better choice than the existing online calculators I've seen -- but all the packages I've seen still have similar issues as above. I considered writing up my own functions ... but if I code 'em in R, why not in javascript? Hence it began.

From my short time here it seems users of this site represent a wide range of statistical expertise/experience levels. I know what I need a power/sample size calculator to do, but that doesn't mean it's good for everybody. Keeping in mind it's a brand new site, any thoughts on the site? PowerAndSampleSize.com

I have a really cool system set up (details of which are probably more interesting for a computer science forum) so that I can add lots of calculators quickly; reason for that is, I plan to eventually have calculators for tons of statistical tests, any I'd ever conceivably need that I can code up to a webpage. I also intend to have enough clear articles there so that even I can remember the details of the calculations when need be, but I also want it to be accessible to a wide range of people, from a non-statistician graduate student, to a seasoned stat wrangler. Like it says on one of my pages, I (and we all) learn so much from the web, it'd be really cool to be able to help others, too.

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