DOUBLE SAMPLING
Definition:
A standard form of sample design for industrial inspection purposes. In accordance with the characteristics of a particular plan, two samples are drawn, n1 and n2, and the first sample inspected. The batch can then be accepted or rejected upon the results of this inspection or the second sample be inspected and the decision made upon the combined result.
Context:
The term has also been used somewhat loosely for what is called multi-phase sampling and the two-stage version of multi-stage sampling. There is a further usage whereby a first sample provides a preliminary estimate of design parameters which govern the size of the second sample to achieve a desired overall result.
MULTI-PHASE SAMPLING
Definition:
It is sometimes convenient and economical to collect certain items of information from the whole of the units of a sample and other items of usually more detailed information from a sub-sample of the units constituting the original sample. This may be termed two-phase sampling, e.g. if the collection of information concerning variate, y, is relatively expensive, and there exists some other variate, x, correlated with it, which is relatively cheap to investigate, it may be profitable to carry out sampling in two phases.
At the first phase, x is investigated, and the information thus obtained is used either (a) to stratify the population at the second phase, when y is investigated, or (b) as supplementary information at the second phase, a ratio or regression estimate being used.
Two-phase sampling is sometimes called "double sampling".
Context:
Further phases may be added if desired. It may be noted, however, that multiphase sampling does not necessarily imply the use of any relationships between variates x and y. The expression is not to be confused with multi-stage sampling.
Not less than double the highest frequency component of the signal you're sampling.
The idea is to first do the subtraction, then multiply the result by 2.
the number itself
The probability of a double sampling plan on the combined samples of two sampling plans depends on the acceptance criteria established for each plan and the characteristics of the population being sampled. In a double sampling plan, an initial sample is evaluated, and if the results are inconclusive, a second sample is taken. The overall acceptance probability will be a function of the probabilities of acceptance from both samples, typically calculated using statistical methods that consider the distribution of the data and the defined acceptance limits. Thus, the exact probability must be determined based on specific parameters of the sampling plans and the underlying population distribution.
i dont know but a ratio table is easier
Two-phase sampling involves selecting initial units from a population through one sampling technique and subsequently selecting final units from the initially drawn units using a different sampling technique. Double sampling, on the other hand, involves selecting two independent samples from the same population, where the second sample is used to check the results of the first sample and make adjustments if needed.
The difference between a double wide and a manufactured home is that the manufactured home is put on a foundation.
26
Not less than double the highest frequency component of the signal you're sampling.
The sampling rate must be at least double the highest frequency component of the modulating signal in order to avoid frequency aliasing.
The difference between a double room and a double standard room is the double often contains two beds. A standard double has just one bed and is designed for two people.
The idea is to first do the subtraction, then multiply the result by 2.
they have no difference.. they are same
I don't think there is a difference.
the double of n is m. is the difference between m and n
difference between single layer and double winding
No