Definition/Meaning | Word/Phrase |
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correlation coefficient in which one variable is many-valued and the other is dichotomous | biserial correlation , biserial correlation coefficient |

correlation coefficient calculated between scores on two halves of a test; taken as an indication of the reliability of the test | chance-half correlation , split-half correlation |

coefficient of agreement (concordance) between different sets of rank orderings of the same set of things | coefficient of concordance |

alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire | constantan , Eureka |

correlation in which large values of one variable are associated with large values of the other and small with small; the correlation coefficient is between 0 and +1 | direct correlation , positive correlation |

correlation in which large values of one variable are associated with small values of the other; the correlation coefficient is between 0 and -1 | indirect correlation , negative correlation |

alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments | Invar |

(physics) a coefficient that expresses how much of a specified property is possessed by a specified substance | modulus |

coefficient of elasticity for a shearing force | modulus of rigidity |

most commonly used method of computing a correlation coefficient between variables that are linearly related | Pearson product-moment correlation coefficient , product-moment correlation coefficient |

borosilicate glass with a low coefficient of expansion; used for heat-resistant glassware in cooking and chemistry | Pyrex |

most commonly used method of computing a correlation coefficient between the ranks of scores on two variables | rank-difference correlation , rank-difference correlation coefficient , rank-order correlation , rank-order correlation coefficient |

correlation coefficient computed for two normally distributed variables that are both expressed as a dichotomy | tetrachoric correlation , tetrachoric correlation coefficient |

(statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance | weight , weighting |

coefficient of elasticity applicable to the stretching of a wire | Young's modulus |

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