| 词汇 | harmonic-mean |
| 释义 | BETA harmonic meancollocation in Englishmeanings of harmonicand meanThese words are often used together. Click on the links below to explore the meanings. harmonic noun[ C ] uk /hɑːˈmɒn.ɪk/ us /hɑːrˈmɑː.nɪk/ music specialized a special note that sounds when a musical note is played that is different from the ... See more at harmonic mean noun[ S ] uk /miːn/ us /miːn/ mathematics specialized the result you get by adding two or more amounts together and dividing the total by the number ... See more at mean Examples of harmonic meanharmonic mean This is much larger than the value for chromosomes from nature, as might be expected since it involves an arithmetic rather than a harmonicmean. The formula is a function of the harmonicmean of the recombination frequencies between all the possible pairs of loci. The harmonicmean procedure was used to account for unequal sample sizes. However, it is a well-established result that for a given sample of nonnegative, non-constant observations, the arithmetic mean will always exceed the harmonicmean. This is the harmonicmean of 60 and 30. For both estimators, simulations demonstrate that the performance is determined mainly by the harmonicmean of sample sizes (data not shown). The harmonicmean is exploited to this end. The harmonicmean of recall and precision is called f-measure. Both the arithmetic mean, ai = (n +1)/2, and the harmonicmean, hl = 2n- l/(n + 1), are easily determined as rational, commensurable values. It is the harmonicmean of the two totals. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The focus so determined would be about 1.3 m, the approximate harmonicmean of the near and far distances. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The metric is based on the weighted harmonicmean of unigram precision and unigram recall. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The harmonicmean plays a role in maximum likelihood estimation for the four parameter case, in addition to the geometric mean. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In population genetics, the harmonicmean is used when calculating the effects of fluctuations in generation size on the effective breeding population. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Equivalently, the harmonicmean is the reciprocal of the arithmetic mean of the reciprocals. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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