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1The product of an integer and all the integers below it; e.g. factorial four (4!) is equal to 24.
- ‘Now Stirling's formula is a classical approximation for the factorial function, and factorials are one way to evaluate binomial coefficients.’
- ‘Stirling wrote to De Moivre pointing out some errors that he had made in a table of logarithms of factorials in the book.’
- ‘The gamma function is undefined for zero and negative integers, from which we can conclude that factorials of negative integers do not exist.’
- ‘The experiment was a completely randomized design, with eight treatment combinations, forming a 4 x 2 factorial (four clones and two watering regimes) with five plants in individual pots per treatment combination as replication.’
- ‘They learned of each other's discoveries because each of them communicated his work to James Stirling, whose approximation for the factorial is a special case of the Euler-Maclaurin summation.’
- 1.1The product of a series of factors in an arithmetical progression.
- ‘‘A factorial is the product of consecutive numbers from 1 to that particular digit and is represented by placing a‘!’’
- ‘In the proof below, we use the fact that e is the sum of the series of inverted factorials.’
Relating to a factor or factorial.‘a factorial design’
- ‘Around 1926, a British statistician, Ronald Fisher, while working in the field of agriculture, developed a new form of experimentation called two-level factorial design.’
- ‘Experimental designs involving factorial combination of multiple independent variables call for some inventiveness when it comes to graphical presentation of data.’
- ‘One possible approach to make this search more systematic is the use of factorial design, which involves a set of experiments intended to identify important effects and interactions.’
- ‘Our trial was of factorial design in order to compare three types of treatment within a single trial, in order to derive the maximum amount of data from the minimum number of patients.’
- ‘A 2 x 4 x 12 factorial design was used to assess the effects of light, temperature and month, respectively, on the germination of Spergularia marina seeds.’
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