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 Feb 2 awarded Benefactor Feb 2 accepted How do you calculate the correlation between the intercept's and beta's standard error in a univariate linear regression? Feb 1 comment How do you calculate the correlation between the intercept's and beta's standard error in a univariate linear regression? Thank you and good point. Jan 31 awarded Promoter Jan 27 asked How do you calculate the correlation between the intercept's and beta's standard error in a univariate linear regression? Jun 22 awarded Notable Question Oct 17 awarded Popular Question May 15 awarded Caucus Sep 11 awarded Yearling Jan 5 comment Can a point be a global extremum but not a local extremum? One sec. Let's say $f(x)=x^2, \forall x \in \mathbb{R}$. Then isn't the interval $(0.9,1]$ still an open subset of $(-\infty,\infty)$ such that 1 is a local maximum? Jan 4 accepted Can a point be a global extremum but not a local extremum? Jan 4 asked Can a point be a global extremum but not a local extremum? Dec 30 accepted Why isn't $\frac{\mathrm{d} }{\mathrm{d} x} \ln(x)$ specified as $\frac{1}{x},x>0$? Dec 30 asked Why isn't $\frac{\mathrm{d} }{\mathrm{d} x} \ln(x)$ specified as $\frac{1}{x},x>0$? Dec 27 comment Implicit Differentiation Proof Each of the answers below is elucidating. Unfortunately, I can only choose one answer, so I chose the fastest response. Dec 27 accepted Implicit Differentiation Proof Dec 27 comment Implicit Differentiation Proof Yes, to some extent, since it says that it's just a special case of the chain rule but it doesn't explain further. Is it because when you are differentiating a mapping with respect to x, you can treat y or any other variables as a function of x and then use the chain rule? That would imply implicit differentiation is generalizable to arbitrarily many other variables. Is that true? Dec 27 asked Implicit Differentiation Proof Sep 16 awarded Autobiographer Sep 11 awarded Scholar