Judgment sample
Encyclopedia
Judgment sample is a type of nonrandom sample
, which is selected based on the opinion
of an expert. Results obtained from a judgment sample are subject to some degree of bias, due to the frame and population
not being identical. The frame is a list of all the unit
s, items, people
, etc that define the population to be studied.
Sample (statistics)
In statistics, a sample is a subset of a population. Typically, the population is very large, making a census or a complete enumeration of all the values in the population impractical or impossible. The sample represents a subset of manageable size...
, which is selected based on the opinion
Opinion
In general, an opinion is a subjective belief, and is the result of emotion or interpretation of facts. An opinion may be supported by an argument, although people may draw opposing opinions from the same set of facts. Opinions rarely change without new arguments being presented...
of an expert. Results obtained from a judgment sample are subject to some degree of bias, due to the frame and population
Statistical population
A statistical population is a set of entities concerning which statistical inferences are to be drawn, often based on a random sample taken from the population. For example, if we were interested in generalizations about crows, then we would describe the set of crows that is of interest...
not being identical. The frame is a list of all the unit
Units of measurement
A unit of measurement is a definite magnitude of a physical quantity, defined and adopted by convention and/or by law, that is used as a standard for measurement of the same physical quantity. Any other value of the physical quantity can be expressed as a simple multiple of the unit of...
s, items, people
People
People is a plurality of human beings or other beings possessing enough qualities constituting personhood. It has two usages:* as the plural of person or a group of people People is a plurality of human beings or other beings possessing enough qualities constituting personhood. It has two usages:*...
, etc that define the population to be studied.