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a variable that may assume only a countable (usually finite) number of values.
1. any type of measurement, quantitative or qualitative, of which a series of individual observations is made so that it has, as a principal characteristic, the potential for variability.
2. has the quality of variability.
an agent in the cause of a disease which is capable of variation in intensity, e.g. weather, as contrasted to one that is not variable, e.g. Salmonella dublin.
in experimental design these refer to factors that affect the dependent variable, but are not themselves influenced by the treatment (e.g. age of animal). The effect of concomitant variables can be removed by suitable experimental design or by including them in the model.
one in which all values within a given range are possible, e.g. birth weights of calves.
costs which vary with the dimensions of the activity. Includes seed, fertilizer, teat dip, worm drench. Called also direct costs. See also fixed costs.
1. in statistics the variable predicted by a regression equation.
2. a variable which depends on other variables for its value.
see discrete variable (below).
one in which the possible values are not on a continuous scale, e.g. the number of sheep in a flock.
independent or predetermined variable.
one not dependent on other variables but capable of affecting dependent variables, thus an input variable.
a measurement relating to area or location.
one relating to chronological time.