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FACTORIAL - 2 reference results
factorial

For any whole number, the product of all the counting numbers up to and including itself. It is indicated with an exclamation point: 4! (read “four factorial”) is 1 × 2 × 3 × 4 = 24. In order for certain formulas involving permutations and combinations to work, 0! is defined to be 1. Factorials are particularly useful in calculating the number of ways an event can occur, for example, the number of possible orders of finish in a race.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Factorial designs in clinical trials: options for combination treatment studies *.
Jul 01, 2005; A FACTORIAL DESIGN provides a cost-effective way of conducting two or more prevention trials, each with its own primary outcome,...
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On k-factorials and Smarandacheials.
Jan 01, 2005; Abstract F. Smarandache defines a k-factorial as n(n - k)(n - 2k) terminating when n - xk is positive and n - (x + 1)k is 0 or...
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Designs of the times: or "just the factorials, Ma'am!" The previous article discussed how experiments are chosen when conducting statistically designed experimentation. This article begins a discussion on factorial designs.
Oct 01, 2002; Editor's Note: This article is Part 7 in a series. See PCI May 2002 for the previous installment. Factorial Designs Factorial is...
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Design-plots for factorial and fractional-factorial designs
Jan 01, 1998; Graphical presentations have been used by many statisticians and engineers to view the properties of particular two- and...
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Minimum-Aberration Two-Level Fractional Factorial Split-Plot Designs.
Feb 01, 1999; It is often impractical to perform the experimental runs of a fractional factorial in a completely random order. In these cases,...
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