sampling error


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sampling error

Surgical pathology An error in a diagnostic work-up, in which insufficient, inadequate, or non-representative material is obtained for analysis, especially biopsy material, less commonly, cytologic samplings

sampling error

(in statistics) a statistical phenomenon in which the variation within a sample is inversely related to the size of the sample. In other words, the smaller the sample the larger the sample error. Thus if 100 people toss 10 coins each, the variation within each sample would be quite high, from perhaps 2 heads: 8 tails, to 8 heads: 2 tails. However, if the same 100 people toss 1000 coins each, the variation would be expected to be proportionately less, from perhaps 350 heads: 650 tails to 650 heads: 350 tails. The variation in a sample can be expressed as, for example, mean ± standard error.
References in periodicals archive ?
The scenario provided several examples of variability for queue initiation time and intensity, as well as the effect on the sampling error for lane density and link speed.
illustrates the differences among fact, belief, and sampling error probabilities.
Bulmer's R* test.--Bulmer's R* test, designed to allow for sampling error, maintained a Type I error rate near or slightly less than the set nominal value of 5% for all simulations (Fig.
Salgado has noted that the values given for sampling error in our original article were incorrect.
Sampling error is usually expressed as relative error which is the ratio of the sampling error of an estimate and the estimate itself.
For age and race, all reported margins of sampling error are at the 95% confidence interval.
For results based on the sample of 792 18- to 29-year-olds, the margin of sampling error is A[+ or -]4 percentage points at the 95% confidence level.
For results based on the total sample of 802 non-Hispanic blacks, the maximum margin of sampling error is A[+ or -]5 percentage points.
For results based on the sample of 2,826 non-Hispanic whites, the margin of sampling error is 2 percentage points.
For results based on the sample of 625 nonretirees, one can say with 95% confidence that the maximum margin of sampling error is 4 percentage points.
For results based on the total sample of 303 Republicans, one can say with 95% confidence that the maximum margin of sampling error is 7 percentage points.
Those based on national adults aged 18 and older generally include more than 15,000 interviews per month and have a maximum margin of sampling error of 1 percentage point.