“In economic surveys of households, many variables have the following characteristics: The variable has a lower, or upper, limit and takes on the limiting value for a substantial number of respondents. For the remaining respondents, the variable takes on a For the remaining respondents, the variable takes on a wide range of values above, or below, the limit.”

— James Tobin

Tobin, James. " Estimation of relationships for limited dependent variables http://cowles.econ.yale.edu/P/cp/p01a/p0117.pdf." Econometrica: journal of the Econometric Society (1958): 24-36. <br class="br">1950s-60s

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American economist 1918–2002

Ralph Brazelton Peck (1912–2008) American civil engineer

as taken by Professor Ralph Peck's Legacy Website http://peck.geoengineer.org/words.html#

“Rather, for all objects and experiences there is a quantity that has an optimum value. Above that quantity, the variable becomes toxic. To fall below that value is to be deprived.”

Gregory Bateson (1904–1980) English anthropologist, social scientist, linguist, visual anthropologist, semiotician and cyberneticist

Source: Mind and Nature: A Necessary Unity, 1979, p. 56

“The potential infinite means nothing other than an undetermined, variable quantity, always remaining finite, which has to assume values that either become smaller than any finite limit no matter how small, or greater than any finite limit no matter how great.”

Georg Cantor (1845–1918) mathematician, inventor of set theory

"Mitteilungen" (1887-8)

“A linguistic variable is a variable whose values are words or sentences in a natural or synthetic language.”

Lotfi A. Zadeh (1921–2017) Electrical engineer and computer scientist

Variant: A linguistic variable is defined as a variable whose values are sentences in a natural or artificial language.
Source: 1970s, Outline of a new approach to the analysis of complex systems and decision processes (1973), p. 28

“Intervening variables are essential to psychological analysis because without them our description of economic behavior would remain incomplete, our understanding of behavior limited, and our predictions of future behavior incorrect.”

George Katona (1901–1981) American psychologist

George Katona (1951). Psychological Analysis of Economic Behavior. McGraw-Hill, New York. p. 31

“A function of a variable quantity is an analytic expression composed in any way whatsoever of the variable quantity and numbers or constant quantities.”

Leonhard Euler (1707–1783) Swiss mathematician

§4
Introduction to the Analysis of the Infinite (1748)

“The general method involved may be very simply stated. In cases where the equilibrium values of our variables can be regarded as the solutions of an extremum (maximum or minimum) problem, it is often possible regardless of the number of variables involved to determine unambiguously the qualitative behavior of our solution values in respect to changes of parameters.”

Paul A. Samuelson book Foundations of Economic Analysis

Source: 1940s, Foundations of Economic Analysis, 1947, Ch. 2 : The Theory of Maximizing Behavior

“There are many variables intertwined in every problem and components of all the variable involved have to be carefully studied. Forming solutions by studying and synthesizing the relationship among key variables seems to be very much in need. The ability to identify a meaning from observable and obtained data is the core of human characteristics in such changing society. Hence, inductive thinking has to be instilled in every learner for a productive citizenship in the changing world of tomorrow.”

Sukavich Rangsitpol (1935) Thai politician

citizenship in the changing world of tomorrow.

“Before we can proceed to a formal definition of conflict we must examine another concept, that of behavior space. The position of a behavior unit at a moment of time is defined by a set of values (subset, to be technical) of a set of variables that defines the behavior unit. These variables need not be continuous or quantitatively measurable. The different values of a variable must, however, be capable of simple ordering; that is, of any two values it must be possible to say that one is 'after' (higher, lefter, brighter than) the other.”

Kenneth E. Boulding (1910–1993) British-American economist

Peace Science Society (International) (1975) Papers - Volumes 24-29. p. 53 summarized: "Boulding begins by explaining what he believes are the four basic concepts to describe a conflict in an analytical way : (1) the party; (2) the behavior space; (3) competition; (4) conflict."
Source: 1960s, Conflict and defense: A general theory, 1962, p. 3

“In mathematics, logic, linguistics, and other abstract disciplines, the systems are not assigned to objects. They are defined by an enumeration of the variables, their admissible values, and their algebraic, topological, grammatical, and other properties which, in the given case, determine the relations between the variables under consideration.”

George Klir (1932–2016) American computer scientist

Source: An approach to general systems theory (1969), p. 40.

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