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Let \(X=exp(Y)\) be a transformation of a random variable \(Y\). This function computes the jacobian \(J(x)\) when using the density of \(Y\) to evaluate the density of \(X\) via $$f(x) = f_y(ln(x)) J(x)$$ where $$J(x) = d/dx ln(x).$$
jac.exp(x, log = TRUE)
value at which to evaluate \(J(x)\)
TRUE to return \(log(J(x))\)
# NOT RUN { jac.exp(1) # }
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