Mathematical Notation¶
Probability and Statistics¶
Symbol |
Formula |
Explained |
|---|---|---|
\(\mu\) |
\(\sum_{x} k P(X=x) = \int_{-\infty}^{\infty} x f(x) d x\) |
|
\(V(X)\) or \(\sigma^2\) |
\(E[(X - E[X])^2] = E[(X - \mu)^2] = E[X^2] - E[X]^2\) |
|
\(\sigma\) |
\(\sqrt{V(X)}\) |
Standard deviation |
\(Cov(X,Y)\) |
Covariance of X and Y |
Covariance of X and Y |
\(\bar{X}\) |
The sample |
The sample mean is an average value |