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  2. Spearman's rank correlation coefficient - Wikipedia

    en.wikipedia.org/wiki/Spearman's_rank_correlation...

    If F(r) is the Fisher transformation of r, the sample Spearman rank correlation coefficient, and n is the sample size, then z = n − 3 1.06 F ( r ) {\displaystyle z={\sqrt {\frac {n-3}{1.06}}}F(r)} is a z -score for r , which approximately follows a standard normal distribution under the null hypothesis of statistical independence ( ρ = 0 ).

  3. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    the population mean or expected value in probability and statistics; a measure in measure theory; micro-, an SI prefix denoting 10 −6 (one millionth) Micrometre or micron (retired in 1967 as a standalone symbol, replaced by "μm" using the standard SI meaning) the coefficient of friction in physics; the service rate in queueing theory

  4. Congeneric reliability - Wikipedia

    en.wikipedia.org/wiki/Congeneric_reliability

    In statistical models applied to psychometrics, congeneric reliability ("rho C") [1] a single-administration test score reliability (i.e., the reliability of persons over items holding occasion fixed) coefficient, commonly referred to as composite reliability, construct reliability, and coefficient omega.

  5. Phi coefficient - Wikipedia

    en.wikipedia.org/wiki/Phi_coefficient

    In statistics, the phi coefficient (or mean square contingency coefficient and denoted by φ or r φ) is a measure of association for two binary variables.. In machine learning, it is known as the Matthews correlation coefficient (MCC) and used as a measure of the quality of binary (two-class) classifications, introduced by biochemist Brian W. Matthews in 1975.

  6. List of social fraternities - Wikipedia

    en.wikipedia.org/wiki/List_of_social_fraternities

    Phi Rho Eta: ΦΡΗ: 1994 National Independent Traditional Active Phi Sigma Alpha: ΦΣΑ: 1928 International CIPFI: Puerto Rican OMNE RARUM CARUM (All that is rare is wanted) Active Phi Sigma Delta: ΦΣΔ: 1909 – 1969: National NIC: Traditional Inactive [ax] Phi Sigma Epsilon: ΦΣΕ: 1910 – 1985: National NIC, Association of Teachers ...

  7. What do teens mean when they say ‘sigma’? - AOL

    www.aol.com/news/teens-mean-sigma-000158935.html

    Sigma males are “considered ‘equal’ to Alphas on the hierarchy but live outside of the hierarchy by choice,” reads the website. Urban Dictionary adds that sigma “is what all 10 year olds ...

  8. List of Asian American fraternities and sororities - Wikipedia

    en.wikipedia.org/wiki/List_of_Asian_American...

    Sigma Phi Omega: ΣΦΩ: 1949 University of Southern California: Asian Americans: Interactive 9 Active [26] Sigma Psi Zeta: ΣΨΖ: March 23, 1994: University at Albany: Asian Americans: NAPA: 20 Active [1] Sigma Sigma Rho: ΣΣΡ: December 10, 1998: St. John’s University: South Asians: NAPA: 28 Active [1] [79] Theta Kappa Phi: ΘΚΦ: June 4 ...

  9. List of social sororities and women's fraternities - Wikipedia

    en.wikipedia.org/wiki/List_of_social_sororities...

    Phi Kappa Pi (aka Alpha Clionian ) ΦΚΠ: 1872 Local SUNY Geneseo: Traditional Active [15] [16] [s] Phi Mu: ΦΜ: 1852 National NPC: Traditional Les Soeurs Fideles (The Faithful Sisters) Active Phi Sigma Rho: ΦΣΡ: 1984 National Independent Engineering Active Phi Sigma Sigma: ΦΣΣ: 1913 National NPC: Traditional Διωκετε Υψηλα ...