Can someone solve this so I can get a direct equation for Cohen's d? #statspic.twitter.com/IlJzWVOGLc
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it's just a long chain of the parts you already got? Or do you also want it simplified and with d popping up again?
A direct equation for adjusting d for measurement error. Can be made by rearranging the three above. @dingding_peng
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so you want to plug in d, n1, n2, reliabilities and get corrected d?
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I mean you could do that but it would only look more messy and not add any information, would it?
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2*((d/sqrt(d^2 + ((n1 + n2)^2/(n1*n2))))/sqrt(rl1 * rl2)))/sqrt(1-((d/sqrt(d^2 + ((n1 + n2)^2/(n1*n2))))/sqrt(rl1 * rl2))^2
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with rl1 and rl2 being the reliabilities. but if I was doing that in my code, I'd prefer multiple lines, way more readable
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Yes, just wondering if there was a neat equation for presentation purposes.
@dingding_pengpic.twitter.com/UOX0ghZlfQ
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aaaah, okay! Now I see. I actually think that the multiple line solution is neater, don't think you can simplify much
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Oh well. I'm not particularly good with algebra, so I'm not the right person ti ask to rearrange stuff without errors! :)
@dingding_peng -
If you're good, maybe you can solve this one! :) http://emilkirkegaard.dk/en/?p=6570 It's something with infinite series that converge
@dingding_peng - 2 more replies
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