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Need help reversing a formula...
Ok, I'll admit it right now.
I don't have as many brain cells as I used to and I need help. I have the following formula in Excel and I'm trying to reverse it.... Answer =NORMSINV(1-X/2)*Y/SQRT(Z) At the Microsoft support site it says this returns the same value as Answer =CONFIDENCE(X,Y,Z) and indeed it does. I have the value for Answer, and the values of X and Y. What formula do I need to get the value of Z? Thanks in advance. I'm going to take some aspirin now... Larry W. Las Vegas, NV |
#2
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Need help reversing a formula...
Hi Larry,
My statistics are pretty rusty, so I have no idea if this is meaningful, but solving for Z algebraically gives you: Z = (NORMSINV(1-X/2)*Y/Answer)^2 -- Rob Bovey, Excel MVP Application Professionals http://www.appspro.com/ * Take your Excel development skills to the next level. * Professional Excel Development http://www.appspro.com/Books/Books.htm "Larry Webb" wrote in message ... Ok, I'll admit it right now. I don't have as many brain cells as I used to and I need help. I have the following formula in Excel and I'm trying to reverse it.... Answer =NORMSINV(1-X/2)*Y/SQRT(Z) At the Microsoft support site it says this returns the same value as Answer =CONFIDENCE(X,Y,Z) and indeed it does. I have the value for Answer, and the values of X and Y. What formula do I need to get the value of Z? Thanks in advance. I'm going to take some aspirin now... Larry W. Las Vegas, NV |
#3
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Need help reversing a formula...
Rob Bovey wrote:
Hi Larry, My statistics are pretty rusty, so I have no idea if this is meaningful, but solving for Z algebraically gives you: Z = (NORMSINV(1-X/2)*Y/Answer)^2 Yeah, that's it. Don't know why I couldn't see that for myself. Too few brain cells left and not enough sleep I guess. Thanks! Larry |
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