Statistical Notation: Definition from Answers.com

Symbol	Reference
∼	has the same distribution as
\|	conditional, e.g. A occurs given that B occurs
B(n, p)	binomial distribution with parameters n and p
Cov(X, Y)	covariance of the random variables X and Y
E(X)	expected value of the random variable X
F	cumulative distribution function
f	probability density function
G	probability-generating function
G²	likelihood-ratio goodness-of-fit statistic
H₀, H₁	null and alternative hypotheses
M	moment-generating function
N(μ, σ²)	normal distribution (mean μ, variance σ²)
n	sample size
P	probability (of an event)
p	probability value
r	product-moment correlation coefficient; residual
s²	sample variance given by Σ_j(x_j−x̄)²/(n−1).
Var(X)	variance of the random variable X
X, Y	random variables
X²	chi-squared test statistic
x	an observation
x̄	sample mean
x_(j)	an ordered observation, e.g. x₍₁₎≤x₍₂₎≤...
x̄_-j, x̂_-j	values calculated omitting observation j
ŷ	an estimate of y
Z	random variable (often standard normal random variable)

	68-95-99.7 rule
	Stochastic modelling (insurance)
	Notation in probability and statistics

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