proportional sample

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Related to proportional sample: stratified sampling, sampling techniques
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Noun1.proportional sample - the population is divided into strata and a random sample is taken from each stratum
statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
sample distribution, sampling, sample - items selected at random from a population and used to test hypotheses about the population
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References in periodicals archive ?
The second one was used for the composite sample, with equal aliquots of milk from each milking session (Experiment 1=13.3 mL; Experiment 2=20 mL) which were then mixed in a single sample for analysis; and the third one was used for the proportional sample, that is the volume of the sample in a milking session was proportional to the milk total volume yielded in each session, and then the samples were mixed in a single sample for analysis.
Rather than using a fixed volume, one proposed strategy involves using a minimal proportional sample volume of 3.8% of the platelet total collection (7).
Proportional sample size of 110 respondents was selected by simple random technique.
The crux of the technology in transient partial flow systems is that it reads real-time exhaust or intake air mass flow rates, then changes flow conditions to maintain proportional sample flow regardless of what the engine flow rate is.

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