unbiased sample

It appears that M67 does not contain an unbiased sample of stars.

All objects up to a certain magnitude must be measured in order to have unbiased samples.

The degrees of freedom of the weighted, unbiased sample variance vary accordingly from N 1 down to 0.

When an algorithm uses a sampling approach, taking unbiased samples is the most important issue that the algorithm might address.

Correcting for this bias yields the "unbiased sample variance":

Researchers can use the PSF to test hypotheses on a fairly large and unbiased sample of the world's cultures.

Net Applications is one of a handful of companies mining advertising/cdn data across the entire web to get something approaching an unbiased sample.

This doesn't strike me as an unbiased sample ... just an example of how many people "uploaded their wireless bill to the Validas analyzer".

This effectively proves the use of the divisor n 1 in the calculation of an unbiased sample estimate of σ.

Unbiased samples of sources, taken from numerous galaxy surveys of the sky show none of the proposed 'irregularities' nor any statistically significant correlations exist.

"Since our network is comprised of hundreds of thousands of unique publishers, it should represent a fair and unbiased sample of overall traffic on the web.

Recent studies use "shotgun" Sanger sequencing or massively parallel pyrosequencing to get largely unbiased samples of all genes from all the members of the sampled communities.

An unbiased estimator for the variance is given by apply Bessel's correction, using N 1 instead of N to yield the unbiased sample variance, denoted s:

For example, an unbiased sample of Australian men taller than 2m might consist of a randomly sampled subset of 1% of Australian males taller than 2m.

In an astronomical context, an unbiased sample might consist of that fraction of a complete sample for which data are available, provided the data availability is not biased by individual source properties.

Unbiased Sample, for First Time Most earlier research on dyslexia worked with children identified by school systems as having dyslexia, but the three new studies worked with an unbiased group chosen from all students.

In metagenomic sequencing, DNA is recovered directly from environmental samples in an untargeted manner with the goal of obtaining an unbiased sample from all genes of all members of the community.

This correction is so common that the term "sample variation" and "sample standard deviation" are frequently used to mean the corrected estimators (unbiased sample variation, less biased sample standard deviation), using n 1.

With the correction, the unbiased sample variance is unbiased, while the corrected sample standard deviation is still biased, but less so, and both are still consistent: the correction factor converges to 1 as sample size grows.

With medium confidence, it was projected that approximately 20 to 30% of plant and animal species assessed so far (in an unbiased sample) would likely be at increasingly high risk of extinction should global mean temperatures exceed a warming of 2 to 3 C above pre-industrial temperature levels.

Observations of an unbiased sample of stars of this type with or without observed planets (exoplanets) showed that the known planet-bearing stars have less than one per cent of the primordial Li abundance, and of the remainder half had ten times as much Li.

For example, the square root of the unbiased estimator of the population variance is not a mean-unbiased estimator of the population standard deviation: the square root of the unbiased sample variance, the corrected sample standard deviation, is biased.