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noradetzky
 3 years ago
Mathematical statistics question. Under what conditions does the function \(f\left(x_1,x_2,\ldots,x_n\right)\) have the error:\[\sigma_f=\sqrt{\left(\frac{\partial}{\partial x_1}f\sigma_{x_1}\right)^2+\left(\frac{\partial}{\partial x_2}f\sigma_{x_2}\right)^2+\ldots+\left(\frac{\partial}{\partial x_n}f\sigma_{x_n}\right)^2}\]
noradetzky
 3 years ago
Mathematical statistics question. Under what conditions does the function \(f\left(x_1,x_2,\ldots,x_n\right)\) have the error:\[\sigma_f=\sqrt{\left(\frac{\partial}{\partial x_1}f\sigma_{x_1}\right)^2+\left(\frac{\partial}{\partial x_2}f\sigma_{x_2}\right)^2+\ldots+\left(\frac{\partial}{\partial x_n}f\sigma_{x_n}\right)^2}\]

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noradetzky
 3 years ago
Best ResponseYou've already chosen the best response.0Notably the delta method http://en.wikipedia.org/wiki/Delta_method#Note mentions this, alongside what looks like gradient functions. \(\sigma_f\) resembles the magnitude of a gradient, but that's not inclusive of variance. So, in other words, I have no idea what's going on.

NotTim
 3 years ago
Best ResponseYou've already chosen the best response.0Me too. I have connections with people who do statistics, and I've done a little data management myself, but I don't know about this. Similar format to what I know, but...

noradetzky
 3 years ago
Best ResponseYou've already chosen the best response.0At this rate I'll never be in analysis research. :( That's okay, though. I'm fine with being a student forever.

NotTim
 3 years ago
Best ResponseYou've already chosen the best response.0None of the really good people are online I think. I'll ask around.

noradetzky
 3 years ago
Best ResponseYou've already chosen the best response.0I don't go around apologizing for everything I can't do; I don't see why you are.

NotTim
 3 years ago
Best ResponseYou've already chosen the best response.0I usually come, answer, and then the person goes away understanding the question. But that hasn't happened here.

noradetzky
 3 years ago
Best ResponseYou've already chosen the best response.0I usually read the textbook and learn something new, but that hasn't happened here either. XD These things are out of my control. The best I can do is correct for it, but I'm definitely not apologizing for it.

NotTim
 3 years ago
Best ResponseYou've already chosen the best response.0Hey, sorry about not be able to help. Post a link in the chats occasionally. Maybe a good person will see it.

noradetzky
 3 years ago
Best ResponseYou've already chosen the best response.0Is it against etiquette to just repost?

Laura*
 3 years ago
Best ResponseYou've already chosen the best response.1@myininaya @across @satellite73 can any of you help with this? Or know who can?

Laura*
 3 years ago
Best ResponseYou've already chosen the best response.1Yes, noradetzky, it is. However, hopefully someone will see this tomorrow. The weekend is usually kinda dead around here.

Laura*
 3 years ago
Best ResponseYou've already chosen the best response.1No, but they are at least pinged now. I don't ping them very often, so this will probably catch their attention.

NotTim
 3 years ago
Best ResponseYou've already chosen the best response.0@LagrangeSon678 @mertsj @zarkon @jim_thompson5910 @Chlorophyll Please help? Man. Feels like I'm calling up powerful unholy forces. Nice.

noradetzky
 3 years ago
Best ResponseYou've already chosen the best response.0I hope the users here aren't accurately described by "powerful" and "unholy". ;D

NotTim
 3 years ago
Best ResponseYou've already chosen the best response.0err...I was being figuratively. Please that statement be figurative and not Literal.

NotTim
 3 years ago
Best ResponseYou've already chosen the best response.0that being literal....ugh.
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