All articles starting with S

Station-keeping

Station-keeping is the maintenance of a satellite's assigned orbital position against natural perturbations: geostationary satellites burn propellant to stay within a control box of about ±0.1° in longitude and inclination.

Sep 19, 2026

Station–Gare des Mines

La Station – Gare des Mines is a nonprofit club and arts space in Paris's 18th arrondissement, opened in 2016 in a former coal station and run by Collectif MU.

Stationary beam radiation therapy

Stationary beam radiation therapy is an external beam radiotherapy technique in which the machine delivers radiation from fixed beam positions without rotating, used for palliative, superficial, and total body treatments.

Stationary bicycle

Stationary bicycle (exercise bike, spin bike): an indoor cycling machine using friction, magnetic, hydraulic, or air resistance. Covers flywheel mechanics, wattage accuracy, calorie burn, bike types, health evidence, and 2025 connected-fitness market changes.

Stationary distribution (Markov chain)

A stationary distribution of a Markov chain is a probability distribution over states that the transition rule leaves unchanged, the equilibrium the chain settles toward in the long run.

Stationary front

A stationary front, also called a quasi-stationary front, is a boundary between warm and cold air masses moving slowly or not at all, often bringing prolonged rain and flooding.

Stationary phase approximation

The stationary phase approximation is an asymptotic method for evaluating integrals of rapidly oscillating functions, where oscillations cancel except near points where the phase's derivative vanishes, such as gravitational-wave modeling.

Stationary point

A stationary point of a differentiable function, also called a critical point, is a point where the derivative is zero and the tangent is horizontal.

Stationary process

A stationary process, also called a stationary stochastic process, is a stochastic process whose joint distributions are unchanged by shifts in time, with strict and weak forms distinguished.

Stationary set

A stationary set is a subset of a limit ordinal that meets every closed unbounded (club) subset of that ordinal, the standard notion of largeness in set theory.

Stationary spacetime

A stationary spacetime is a spacetime in general relativity that looks the same at every time, admitting a timelike Killing vector field; rotating black holes are stationary but not static.

Stationary wavelet transform

The stationary wavelet transform (SWT), also called the undecimated wavelet transform, is a variant of the discrete wavelet transform that omits downsampling, restoring translation invariance and improving denoising.

Stationery

Stationery is the collective term for writing and office materials such as paper, pens, and envelopes; in a narrower sense it means special paper for writing letters.

Stations of the Cross

The Stations of the Cross, also known as the Way of the Cross or Via Crucis, is a Christian devotion of fourteen stations depicting Christ's Passion.

Statiq

Statiq is an Indian electric vehicle charging company founded by Akshit Bansal and Raghav Arora in 2019, operating a public charging network backed by Y Combinator and Shell.

Statism

Statism (French étatisme) is the doctrine of state supremacy and state intervention in economic, social, and personal affairs, contrasted with liberalism and anarchism, spanning Hobbes, Hegel, Bakunin's critique, and the developmental state.

Oct 22, 2026

Statism and Anarchy

Statism and Anarchy (Gosudarstvennost' i anarkhiia) is an 1873 book by the Russian anarchist Mikhail Bakunin, predicting that a dictatorship of the proletariat would become dictatorship over the proletariat.

Statistic

A statistic, also known as a sample statistic, is a number computed from a sample, such as the sample mean, used to describe or draw conclusions about a population.

Statistica

Statistica is a commercial statistics, data mining, and analytics software package developed by StatSoft of Tulsa, Oklahoma, beginning in the mid-1980s and now sold as Spotfire Statistica under TIBCO.

Statistical and Applied Mathematical Sciences Institute

The Statistical and Applied Mathematical Sciences Institute (SAMSI) was a research institute in Research Triangle Park, North Carolina, run by Duke, NCSU, and UNC from 2002.

Statistical arbitrage

Statistical arbitrage is a quantitative trading strategy that uses statistical models to exploit temporary price misalignments between related assets, holding market-neutral, mean-reverting positions for seconds to weeks.

Statistical classification

Statistical classification, also called pattern classification, is the machine learning task of predicting which class an example belongs to, using methods such as logistic regression and support vector machines.

Statistical disclosure control

Statistical disclosure control, also known as disclosure avoidance, is the set of methods statistical agencies use to keep published statistics from revealing information about individuals or businesses.

Statistical dispersion

Statistical dispersion, also called statistical variability or spread, is the degree to which values of a variable or probability distribution differ, measured by variance, standard deviation, range, and interquartile range.

Statistical distance

A statistical distance is a quantity measuring how different two probability distributions, or a distribution and a model, are, underlying hypothesis testing, model selection, and minimum-distance estimation.

Statistical Distributions (book)

Statistical Distributions is a Wiley quick-reference handbook of formulas, properties, and tables for the probability distributions most often met in applied statistics, first published in 1975 and now in its fourth edition.

Statistical energy analysis

Statistical energy analysis (SEA) is a vibro-acoustics method predicting high-frequency vibration and sound by balancing energy between coupled subsystems, used on aerospace vehicles and other large lightweight structures.

Statistical hypothesis test

A statistical hypothesis test, also called a significance test, is a procedure for deciding whether sample data are inconsistent with a stated hypothesis, built around a null hypothesis.

Statistical hypothesis testing

Statistical hypothesis testing is a method for deciding whether observed data are consistent with a null hypothesis, by computing a test statistic and reporting a p-value or a reject decision.