Standard-deviation meaning

stăndərd
A statistic used as a measure of the dispersion or variation in a distribution or set of data, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.
noun
0
0
(statistics) A measure of variability equal to the square root of the arithmetic average of the squares of the deviations from the mean in a frequency distribution.
noun
0
0
A statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.
0
0
In statistics, the average amount a number varies from the average number in a series of numbers.
0
0
The degree that a single value in a group of values varies from the mean (average) of the distribution. Standard deviation is a statistical measure that uses past performance of an investment or portfolio to determine the potential range of future performance and assess the probability of that performance. Standard deviations can be calculated for an individual security or for the entire portfolio.
0
0
Advertisement
(statistics) A measure of how spread out data values are around the mean, defined as the square root of the variance.
noun
0
0

Origin of standard-deviation

  • Coined by English mathematician Karl Pearson in 1894 in his paper "On the dissection of asymmetrical frequency curves".

    From Wiktionary

Standard-deviation Sentence Examples

  • Thus a series of arrays of beech leaves, gathered, subject to the precautions indicated, from each of loo beech trees in Buckinghamshire by Professor Pearson, gave 16.1 as the mean number of veins per leaf, the standard deviation of the veins in the series being 1.735.

  • The mean and standard deviation of all first leaves or of all second leaves will clearly be the same as those already determined for the series of leaves; since every leaf in the series is used once as a first member and once as a second member of a pair.

  • We see therefore that while leaves, gathered in equal numbers from each of loo trees, are distributed about their mean with a standard deviation of 1.735 veins, the leaves gathered from a single tree are distributed about their mean with a standard deviation of 1.426 veins, the ratio between variability of the race and variability of the individual tree being 1 - (0-5699)1=0.822.

  • We may therefore conclude that for large classes of characters, both animal and vegetable, the variability of an individual, as measured by the standard deviation of its undifferentiated but repeated organs, is a constant fraction of the variability of its race, as measured by the standard deviation of the corresponding series of organs produced by all the individuals of its race.

  • E is the normalized structure amplitude, SIGE is its standard deviation.

More sentences →

Related articles

Also Mentioned In

Words near standard-deviation in the Dictionary