Quantity
Quantity (Latin quantitas: size, quantity ) refers to the amount or number of substances or objects or the frequency of operations. Quantity is expressed in numeric values or specifying proportions or ratios. Examples: all over Germany, 30 grams, less than.
The determination of the quantity is referred to in science as quantification.
In the planning and forecasting quantitative approaches describe forecasting methods that attempt on mathematical algorithms future events (such as a need ) to predict.
In portfolio management, and the field of investment management describes the quantitative composition of a fund or portfolio of mathematical approaches.
Quantity and quality
The term quantity is in the idiom quantity does not equal quality used as the antonym of quality. This is factually incorrect because quantity as an indication of the numerical value of a metric size always qualitative ( the properties of a thing in question ) involves aspects. An example from the medical field: The blood pressure is 120/80 mmHg. The quantitative determination refers to the quality of blood pressure, which is indicated in the unit mmHg, also this finding may include the qualitative aspect that blood pressure is in the normal range. All quantitative data refer to certain qualities that are captured quantitatively by the quantitative data. This applies in particular to medical findings, which always consist of qualitative and quantitative statements. How closely the quality and quantity with each other, shows the well-known quotation from Paracelsus: All things are poison and nothing is without poison; makes only the dose that a thing ' is not a poison (see also poison dose, Lethal dose ).
The Nobel Prize winner for Physics Philip W. Anderson has about a 1972 article in Science written ( More is Different )
Related terms
- Quantum (from Latin how much?, Or how large?) Can be found in common parlance as a term for a certain amount.
- Quantum satis, short Qs or qs (from Latin as much as is needed to ... ) denotes a quantity in medicine and food law.
- Quant concept of physics.
- Ounce, old German trade weight.
- Quantifier, a logical operator of predicate logic.