# Tag Info

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• 541
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• 12.7k
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### How to read scientific notation output (numbers that include "e")?

The "e" is a symbol for base-10 scientific notation. The "e" stands for $\times 10^{\rm exponent}$. So -1.861246e-04 means $-1.861246 \times 10^{-4}$. In fixed-point notation that would be -0....
• 13.1k

### Why is the Beta Distribution Called the Beta Distribution?

Florian Cajori, in History of Mathematical Notations Vol. II (1928), wrote ... in the same paper of 1730 Euler gave what we now call the "beta function." ... About a century after Euler's first ...
• 327k
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### What does a subscript on a probability represent?

Maybe this helps: $P$ is the distribution of random variable $x$ given the value of random variable $y$. And this distribution has parameters $\theta$. By varying the parameters, you get different ...
• 1,646
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### What does 1 with an inequality in the subscript mean?

$\mathbb{1}_{x\ge a}$ is an indicator function, that is equal to $1$ when $x\ge a$ and zero otherwise. Multiplying by it is a fancy, math way of saying that everything else is equal to zero. In this ...
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### What does a subscript on a probability represent?

Abhinav Gupta gave a nice example (+1). The general answer is that you can use the subscript to carry descriptive information about the distribution. For example, the definition of independence can be ...
• 139k
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### What does Φ mean?

The Phyrexian or Greek letter Φ is being used to describe the CDF (cumulative distribution function) of the standard normal. The lowercase Greek letter φ is being used to describe the PDF (probability ...
• 80.9k
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### Sample notation: When to use capital $N$ vs lowercase $n$?

I'd say the second notation is common, although evidently not universal, namely that $n$ is used for sample size and $N$ for population size. By accident, perhaps, rather than design, it matches a ...
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