Statistical Weight

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statistical weight

[stə′tis·tə·kəl ′wāt]
A number assigned to each value or range of values of a given quantity, giving the number of times this value or range of values is found to be observed.
(statistical mechanics)
The number of microscopic states that correspond to a given macroscopic state.
A multiplicative factor in the expression for the probability of finding a system in a given quantum state, usually equal to the number of degenerate substates contained in the state.

Statistical Weight


In quantum mechanics and quantum statistical mechanics, the statistical weight is the number of different quantum states with a given energy—that is. the degree of degeneracy. If the energy assumes a continuous series of values, the statistical weight is understood as the number of states in a given energy range. In classical statistical mechanics, the size of a volume element of phase space is sometimes called the statistical weight.

References in periodicals archive ?
These are difficult, expensive studies to carry out because you need a large enough group of subjects for statistical weight, you have to ensure compliance and you have to monitor what is going on.
As a result, the researchers did not have the number of participants in each group they would have liked to give the findings statistical weight.
In some instances, this group of voters is given a statistical weight that lowers its overall representativeness in the likely voter pool.
Though her sample size was too small to carry statistical weight, Holtzer's numbers do offer anecdotal interest: support for same-sex marriage among Kansas freshmen may lag behind the national average for college freshmen, but it still remains well ahead of the general U.
Examiners look at about 15 of those regions, and can say with certainty if two DNA samples came from the same person, and add a statistical weight.
Cates acknowledged at a meeting on contraceptive technology sponsored by Contemporary Forums that this post hoc subanalysis did not carry the statistical weight of a primary outcome.
Every photon has assigned statistical weight which decrease from an initial value of 1 as it moves through the substrate, and equals [a.
The rationale for straightforward trials, which often have broader eligibility criteria, is to provide a better real-world picture of therapeutic outcomes and lend greater statistical weight to modest treatment differences.
We have to be careful with the overall figure of a reduction of three per cent because that figure attaches the same statistical weight to a bicycle theft as a murder.
The sample was stratified by surveillance area, year, and hospital, and each record was given a constant statistical weight based on the inverse of its probability of selection.
For instance, the statistical weight for compensation package was 42% while the students' self-insight weight was 22%.
The statistical weight control system, in addition to the MG2 Automatic Capsule Bushing Cleaning Device and the automatic cleaning of the empty capsule feed tube, helped us bring this product out on time.

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