Statistics Symbols in Alphabetical Order
statistics symbols
- α: significance level (type I error).
- b or b0: y intercept.
- b1: slope of a line (used in regression).
- β: probability of a Type II error.
- 1-β: statistical power.
- BD or BPD: binomial distribution.
- CI: confidence interval.
- CLT: Central Limit Theorem.
- d: difference between paired data.
- df: degrees of freedom.
- DPD: discrete probability distribution.
- E = margin of error.
- f = frequency (i.e. how often something happens).
- f/n = relative frequency.
- HT = hypothesis test.
- Ho = null hypothesis.
- H1 or Ha: alternative hypothesis.
- IQR = interquartile range.
- m = slope of a line.
- M: median.
- n: sample size or number of trials in a * binomial experiment.
- N: population size.
- ND: normal distribution.
- σ: standard deviation.
- σx̅: standard error of the mean.
- σp̂: standard error of the proportion.
- p: p-value, or probability of success in a * binomial experiment, or population proportion.
- ρ: correlation coefficient for a population.
- p̂: sample proportion.
- P(A): probability of event A.
- P(AC) or P(not A): the probability that A doesn’t happen.
- P(B|A): the probability that event B occurs, given that event A occurs.
- Pk: kth percentile. For example, P90 = 90th percentile.
- q: probability of failure in a binomial or geometric distribution.
- Q1: first quartile.
- Q3: third quartile.
- r: correlation coefficient of a sample.
- R2 : coefficient of determination.
- s: standard deviation of a sample.
- s.d or SD: standard deviation.
- SEM: standard error of the mean.
- SEP: standard error of the proportion.
- t: t-score.
- μ mean.
- ν: degrees of freedom.
- X: a variable.
- Χ2: chi-square.
- x: one data value.
- x̄: mean of a sample.
z: z-score.
Miscellaneous Statistics Symbols
- ~ has the distribution of (source).
- = equal to.
- ≈ almost equal to.
- > greater than.
- < less than.
- ≠ not equal to.
- ≤ less than or equal to.
- ≥ greater than or equal to.
- Σ Summation.