from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The 18th letter of the Greek alphabet. See Table at alphabet.
- n. A sigma factor.
- n. A sigma baryon.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.
- n. The symbol Σ, used to indicate summation of a set or series.
- n. The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
from the GNU version of the Collaborative International Dictionary of English
- n. The Greek letter Σ, σ, or ς (English S, or s). It originally had the form of the English C.
from The Century Dictionary and Cyclopedia
- n. The name of the Greek letter
Σ, σ, ς, equivalent to the English S, s. (For its early forms, see under S.)
- n. An S-shaped or sigmoid flesh-spicule of a sponge.
- n. The curve of the letter S or any approximate curve.
- n. In descriptive biol., one of the S-shaped ridges on the surface of certain molluscan shells, as those of gastropods and cephalopods.
- n. In experimental psychology, the time-unit, of a second: abbreviated
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the 18th letter of the Greek alphabet
"Three sigma" is a manufacturing concept used to control processes, a concept that I am intimately familiar with.
The standard of comparison, 125 [sigma], is shorter than most of the reaction times recorded, but since the time measured was always that from the breaking to the making of the circuit passing through the chronoscope it cannot be urged that there were errors resulting from the difference of magnetization which was caused by variations in the reaction time.
I called sigma support line and they gave mixed opinions.
He was as honorably decorated as any of the American Joint Chief’s of Staff; even wearing his gold colored in sigma upon his green military cap.
This significance is 3.8 sigma, which is comparable to the UTfit difference, although in a totally different process.
Also, I believe Toyota is six sigma, which is less than 3.4 errors/1 million chances or 00. 00034%, so they would tear their arms out if they were at 00.04%. —
Summers quoted at Marginal Revolution rationalized by talking about the gender ratios at 3.5-4 sigma, which is above the 99.9th percentile.
Usually we demand five sigma, that is five standard deviations from the peak, to claim “discovery.”
Often, that level of probability is arbitrarily set to a value like 95%, or two standard deviations, two sigma, which is about 98% for a normal distribution.
I mean, the highest rated PS3 game thusfar is ninja gaiden sigma, which is simply another remake of the origional from the xbox a spiffy remake, but a remake nonetheless.