chi
Represents the twenty-second letter of the Greek alphabet, commonly used in statistics, mathematics, and scientific notation.
Overview
A versatile Greek letter that appears frequently across multiple scientific disciplines and mathematical contexts:
- Widely used in statistics for chi-square tests and distributions
- Common in quantum mechanics to represent wavefunctions
- Appears in chemistry for electron configurations and molecular orbitals
- Used in mathematics for characteristic functions and special functions
- Often employed in physics for various quantities and parameters
Examples
Testing statistical independence using the chi-squared statistic.
\chi^2 = \sum_{i=1}^{n} \frac{(O_i - E_i)^2}{E_i}Characteristic function in probability theory.
\chi_X(t) = \mathbb{E}[e^{itX}]Wave function in quantum mechanics.
\hat{H}\chi = E\chi