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Categories

Data Science & Statistics

Answered: If $a = 3$, then what is the value of $7 + 5a$ ?
Posted on Tuesday October 19, 2021

$\textbf{Answer:}$

$22$

 

$\textbf{Explanation:}$

we need to substitute in $a=3$ into $7+5a$

$ \implies 7+5a$

$ = 7+5(3)$

$ = 22$

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Answered: Let \(X\) be a continuous random variable with p.d.f: \[ f(x)= \begin{cases}a x, & 0
Posted on Saturday October 16, 2021

Since \(f(x)\) is p.d.f \(\int_{-\infty}^{\infty} f(x) d x=1\)
\[
\begin{aligned}
&\Rightarrow \int_{0}^{1}(a x) d x+\int_{1}^{2} a d x+\int_{2}^{3}(-a x+3 a) d x=1 \\
&\left(\frac{a...

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Answered: What is a dummy variable?
Posted on Saturday October 16, 2021

A device used in a multivariable regression model to describe a categorical predictor without assuming a numeric scoring. Indicator variable might be a better term. For example, treatments \(A,...

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Answered: Why should a machine learning model be good at discrimination?
Posted on Saturday October 16, 2021

A variable or model's discrimination ability is its ability to separate subjects having a low responses from subjects having high responses. One way to quantify discrimination is the ROC curve area.

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Answered: What is detectable difference when determining treatment effect?
Posted on Saturday October 16, 2021

The value of a true population treatment effect (difference between two treatments) that if held would result in a statistical test having exactly the desired power.

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