2. In statistics, the Greek letter sigma is used to denote standard deviation from the mean. The term ‘sigma’ has a few relevant definitions. Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. stigma: [noun] a scar left by a hot iron : brand. Practice Problems 1. Type: noun; The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient. For K-12 kids, teachers and parents. Meaning of Sigma. Sigma-2 receptors, expressed in a variety of normal healthy tissues such as liver, kidneys, endocrine glands, and in the central nervous system, may be overexpressed in tumor cells. What does Sigma mean? (Fluorine F 18 ISO-1, NCI Thesaurus) The sigma‑1 receptor is a very small protein present in neurons, and is capable of modulating the action of opioid receptors. A sum or aggregate. n. 1. The act or process of adding; addition. Freebase (0.00 / 0 votes) Rate this definition: Sigma. Six Sigma is a business improvement approach that seeks to find and eliminate causes of defects in business processes by focusing on process outputs that are of critical importance to customers and as a result process performance is enhanced, customer satisfaction is improved, and the bottom-line is affected through savings and increased revenue (Snee, 2004). sigma . First and foremost, sigma is a letter. What is the Sigma Symbol? ‘The sigma bond occupies the internuclear space, and the two pi bonds are at 90° angles to each other surrounding the carbon-carbon internuclear space.’ ‘The triple bond is composed of one sigma bond from overlap of sp hybrid orbitals, and two pi bonds, from overlap of two sets of p orbitals.’ In the system of Greek numerals it has a value of 200. Translation of 'Sigma' by Secret Garden from Gaelic (Irish Gaelic) to English Deutsch English Español Français Hungarian Italiano Nederlands Polski Português (Brasil) Română Svenska Türkçe Ελληνικά Български Русский Српски العربية فارسی 日本語 한국어 Definition of Sigma Level: Determining sigma levels of processes (one sigma, six sigma, etc.) It is the eighteenth letter of the Greek alphabet. Sigma is the eighteenth letter of the Greek alphabet, and carries the 'S' sound. a mark of shame or discredit : stain. As is the case with most of the other alphabets, even English for that matter, two different symbols are used to represent sigma … A concluding argument after the presentation of a … translation and definition "sigma", English-Tagalog Dictionary online. In the following practice problems, students will find sigma, whether upper case or lower case, by recalling the meaning of these Greek letters in mathematics and statistics. Written in its uppercase form it is the summation mathematical operator. Sigma notation synonyms, Sigma notation pronunciation, Sigma notation translation, English dictionary definition of Sigma notation. allows process performance to be compared throughout an entire organization, because it is independent of the process. 3. Define Sigma notation. , .] Being the eighteenth letter in the Greek alphabet, Sigma comes right after the letter Rho and is followed by Tau. It is merely a determination of opportunities and defects, however the terms are appropriately defined for that specific process. In the 1920s, statistical quality control pioneer Walter Shewhart proposed that in manufacturing, three sigma from the mean is the tipping point that indicates a process has too many defects and requires correction. It originally had the form of the English C. Etymology: [L., from Gr. 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