# Dictionary Definition

quantitative adj

1 expressible as a quantity or relating to or
susceptible of measurement; "export wheat without quantitative
limitations"; "quantitative analysis determines the amounts and
proportions of the chemical constituents of a substance or mixture"
[ant: qualitative]

2 relating to the measurement of quantity;
"quantitative studies"

3 (of verse) having a metric system based on
relative duration of syllables; "in typical Greek and Latin verse
of the classical period the rhymic system is based on some
arrangement of long and short elements" [ant: syllabic, accentual]

# User Contributed Dictionary

## English

### Pronunciation

- /ˈkwantɪtejtɪv/ or /kwaɾ ̃ɪtejtɪv/

### Adjective

#### Related terms

#### Translations

- Czech: kvantitativní
- Finnish: määrällinen, kvantitatiivinen
- Italian: quantitativo
- Norwegian: kvantitativ
- Polish: mierzalny

#### See also

## Italian

### Adjective

quantitative- Feminine plural form of quantitativo

# Extensive Definition

A 'quantitative' attribute is one that exists in
a range of magnitudes, and can therefore be measured. Measurements of
any particular quantitative property are expressed as a specific
quantity, referred to as a unit,
multiplied by a number. Examples of physical
quantities are distance, mass, and time. Many attributes in the social
sciences, including abilities and personality traits, are also
studied as quantitative properties and principles.

## Historical background

### The classical concept of quantity

In the classical definition of measurement, the structure quantitative property is such that different magnitudes of the quantity stand in relation to one another as ratios which, in turn, can be expressed as real numbers. Measurement is the determination or estimation of ratios of quantities. Quantity and measurement are therefore mutually defined: quantitative attributes are those which it is possible to measure, at least in principle. The classical concept of quantity can be traced back to John Wallis and Isaac Newton, and was foreshadowed in Euclid's Elements (Michell, 1993).### The representational theory of measurement

In the representational theory, measurement is regarded as "the correlation of numbers with entities that are not numbers" (Nagel, 1932). In some forms of representational theory, numbers are assigned on the basis of correspondences or similarities between the structure of number systems and the structure of qualitative systems. A quantitative property is therefore one for which such structural similarities can be established. In other forms of representational theory, such as that implicit within the work of Stanley Smith Stevens, numbers need only be assigned according to a rule.## Fundamental considerations in quantitative research

Whether numbers obtained through an experimental procedure are considered measurements is, on the one hand, largely a matter of how measurement is defined. On the other hand, the nature of the measurement process has important implications for scientific research. Firstly, many arithmeitic operations are only justified for measurements either in the classical sense described above, or in the sense of interval and ratio-level measurements as defined by Stevens (which arguably describe the same thing). Secondly, quantitative relationships between different properties which feature in most natural theories and laws imply that the properties have a specific type of quantitative structure; namely, the structure of a continuous quantity. The reason for this is that such theories and laws display a multiplicative structure (for example Newton's second law).Continuous quantities are those for which
magnitudes can be represented as real numbers
and for which, therefore, measurements can be expressed on a
continuum.
Continuous quantities may be scalar
or vector
quantities. For example, SI units are
physical units of continuous quantitative properties, phenomena,
and relations such as distance, mass, heat, force and angular
separation. The classical concept of quantity described above
necessarily implies the concept of continuous quantity.

Recording observations with numbers does not, in
itself, imply that an attribute is quantitative. For example,
judges routinely assign numbers to properties such as the perceived
beauty of an exercise (e.g. 1-10) without necessarily establishing
quantitative structure in any sort of rigorous fashion. A
researcher might also use the number 1 to mean "Susan", 2 to mean
"Michael", and so on. This, however, is not a meaningful use of
numbers: the researcher can arbitrarily reassign the numbers (so
that 1 means "Michael" and 2 means "Susan") without losing any
information. Put another way, facts about numbers (for example,
that 2 is greater than 1, that 5 is two more than 3, and that 8 is
twice 4) don't mean anything about the names corresponding to those
numbers. A person's name is not, therefore, a quantitative
property.

Whether counts of objects or observations are
considered measurements is also largely a matter of how measurement
is defined. Again, though, an important consideration is the manner
in which resulting numbers are used. Counts are not measurements of
continuous quantities. If, for example, a researcher were to count
the number of grains of sand in a specified volume of space on a
beach, the result denumerates how many separate grains there are;
i.e. the number of separate distinguishable entities of a specific
type. Arithmetic operations, such as addition, have meaning only in
this specific sense. For instance, combining 5 and 4 grains of sand
gives 9 grains of sand. The numbers used in this case are therefore
the natural
numbers.

Any object is characterized by many attributes,
such as colour and mass, only some of which constitute continuous
quantities. For example, the mass of a specific grain of sand is a
continuous quantity whereas the grain, as an object, is not. Thus,
the mass of a grain of sand can be used as a unit of mass because
it is possible to estimate the ratio of the mass of another object
to the mass of a grain of sand, given an appropriate
instrument.

In the social sciences, it is also common to
count frequencies of observations; i.e. frequencies of observable
outcomes in an experiment. Examples include the number of correct
scores on an assessment of an ability, and the number of statements
on a questionnaire endorsed by respondents. Provided each
observable outcome is the manifestation of an underlying
quantitative attribute, such frequencies will generally indicate
relative magnitudes of that attribute. Strictly speaking, however,
counts and frequencies do not constitute measurement in terms of a
unit of continuous quantity.

## Use in prosody and poetry

In prosody and poetic meter, syllable weight can be a governing principle. Many linguists use morae as a unit of syllable weight—a syllable with more morae is heavier than one with fewer morae. Commonly, syllables with naturally long vowels, diphthongs, and vowels followed by two or more consonants are said to be “heavy”, “long”, or “bimoraic”, whereas syllables with naturally short vowels, followed by only one or no consonant, are said to be “light”, “short”, or “monomoraic”. There is, however, considerable variation across the world's languages as to which coda-consonants contribute a mora to the syllable (i.e., make it heavy). At one end of the variation, only the length of the vowel determines syllable weight; at the other end each coda-consonant counts as one mora. Some languages use syllable weight in assigning word accent. Some poetic meters are based on the arrangement of heavy and light syllables.## References

- Michell, J. (1993). The origins of the representational theory of measurement: Helmholtz, Hölder, and Russell. Studies in History and Philosophy of Science, Vol. 24 No. 2, 185-206.
- Nagel, E. (1932). Measurement. Erkenntnis, 2, 313-33, reprinted in A. Danato and S. Morgenbesser (Eds.), Philosophy of Sciences (pp. 121-140). New York: New American Library.

quantitative in Dutch: Kwantitatief