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  2. Contingency table - Wikipedia

    en.wikipedia.org/wiki/Contingency_table

    Another choice is the tetrachoric correlation coefficient but it is only applicable to 2 × 2 tables. Polychoric correlation is an extension of the tetrachoric correlation to tables involving variables with more than two levels. Tetrachoric correlation assumes that the variable underlying each dichotomous measure is normally distributed. [5]

  3. The Vectors of Mind - Wikipedia

    en.wikipedia.org/wiki/The_Vectors_of_Mind

    The bulk of the chapter considers mathematical issues, including the rank of a matrix and methods for estimating the commonalities of the correlation matrix (the diagonal elements). Chapter III: The Centroid Method. A computation method is developed for factoring a correlation matrix, which is a symmetric matrix of real elements.

  4. Polychoric correlation - Wikipedia

    en.wikipedia.org/wiki/Polychoric_correlation

    In statistics, polychoric correlation [1] is a technique for estimating the correlation between two hypothesised normally distributed continuous latent variables, from two observed ordinal variables. Tetrachoric correlation is a special case of the polychoric correlation applicable when both observed variables are dichotomous .

  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. Psychometric software - Wikipedia

    en.wikipedia.org/wiki/Psychometric_software

    Psych is an R package providing routines for personality, psychometrics, and experimental psychology. Its functions support: Scale construction using factor analysis, cluster analysis, and reliability analysis; Basic descriptive statistics; Item response theory via factor analysis of tetrachoric and polychoric correlations

  7. Promoting Healthy Choices: Information vs. Convenience - HuffPost

    images.huffingtonpost.com/2012-12-21-promoting...

    information had little net effect in our sample, while the subtle manipulation of convenience had a large effect on calorie intake. Encouraging Healthy Eating Behaviors Despite the focus of current and past legislation on providing information, there is little evidence that doing so has much impact.

  8. Netizens Can’t Get Enough Of This Woman Who Built Her ... - AOL

    www.aol.com/woman-rescues-hundreds-disabled-pups...

    For example, this one woman in Turkey has rescued hundreds of disabled stray dogs who were finally given a second chance at life, all thanks to her. It was over 4 years ago when a woman from ...

  9. California town prays for recovery of 2 kindergartners in ...

    www.aol.com/2-students-wounded-suspected-gunman...

    Roman Mendez, 6, one of two kindergarten students who was shot at the Feather River Adventist School in Oroville. He sustained two gunshot wounds and remains in critical but stable condition ...