An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Statistics: Two random variables X and Y if and only if the value of X has no influence on the value of Y and vice versa.

→ dependent; → random; → variable.

1) General: Made or occurring without a definite pattern, plan, or system; haphazard arrangement as if due to pure chance.
2) Statistics: Of or characterizing a process of selection in which each item of a population has an equal probability of being chosen.
See also:
→ random access memory, → random error, → random experiments, → random noise, → random sample, → random structure, → random thermal motion, → random variable , → independent random variables, → random walk, → randomization, → randomize, → randomness.

M.E. raundon, random "impetuosity, speed," from O.Fr. randon "rush, disorder, impetuosity," from randir "to run fast."

Kâturé originally "dazzled, confused," variants katré "disorderly, ragged, tattered, babble, meaningless or incoherent speech," katreyi "disorderly, at random;" maybe from kat- "to fall;" → case.

In computer technique, a configuration of memory cells that hold data for processing by a central processing unit (CPU). The term random derives from the fact that the CPU can retrieve data from any individual location, or address, within RAM.

→ random; → access; → memory.

The fluctuating part of the overall error that varies from measurement to measurement. Normally, the random error is defined as the deviation of the total error from its mean value; opposite of → systematic error.

→ random; → error.

Statistics: Experiments in which results will not be essentially the same even though conditions may be nearly identical.

→ random; → experiment.

Unpredictable noise comprising large numbers of frequent, transient impulses occurring at statistically random time intervals. Thermal noise is a form of random noise.

→ random; → noise.

A sample selected at random from a population.

→ random; → sample.

Crystalline arrangement in which equivalent positions are not necessarily occupied by atoms of a single kind.

→ random; → structure.

The agitated motion of molecular, atomic, or → subatomic particles in all possible directions at any temperature, except at → absolute zero, where → thermal motion would cease.

→ random; → thermal; → motion.

A quantity that takes different real values as a result of the → outcomes of a → random event or experiment involving specified probabilities.

→ random; → variable.

The trajectory consisting of a series of successive moves in which the direction and size of each move is randomly determined.

→ random; → walk.

Arrangement of data in such a way as to simulate chance occurrence.

Verbal noun of → randomize.

To arrange or select in a random manner in order to reduce bias and interference caused by irrelevant variables.

Verbal form of → random.

The property of being random.

State, condition noun of → random.