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

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noradetzkyBest ResponseYou've already chosen the best response.0
Notably 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.
 2 years ago

NotTimBest ResponseYou've already chosen the best response.0
Me 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...
 2 years ago

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

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

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

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

noradetzkyBest ResponseYou've already chosen the best response.0
I 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.
 2 years ago

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

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

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

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

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

NotTimBest 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.
 2 years ago

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

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

NotTimBest ResponseYou've already chosen the best response.0
that being literal....ugh.
 2 years ago
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