Can you help me understand this pdf derivation please? The part that I don't understand is when we differentiate $F_x(\frac{y - b} {a})$ by $dy$. Where does $\frac{1}{|a|}$ came from? How this differentiation happens?
2026-03-27 13:47:15.1774619235
Can you help me understand this PDF derivation please?
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when you calculate the derivative of an integral function (that is your CDF) you get
$$\frac{d}{dx}\int_{-\infty}^{a(x)}f(t)dt=a'(x)f(a(x))$$
the absolute value is related to the fact that if $a(x)$ is increasing or decreasing the result does not change