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  2. USMLE Step 3 - Wikipedia

    en.wikipedia.org/wiki/USMLE_Step_3

    Step 3 is the final exam in the USMLE series of examinations. It is part of the licensing requirements for Doctors of Medicine (M.D.), including international medical graduates aiming to practice medicine in the United States. Generally, it is a pre-requisite of the majority of the state licensing boards.

  3. Correlation coefficient - Wikipedia

    en.wikipedia.org/wiki/Correlation_coefficient

    A correlation coefficient is a numerical measure of some type of linear correlation, meaning a statistical relationship between two variables. [ a ] The variables may be two columns of a given data set of observations, often called a sample , or two components of a multivariate random variable with a known distribution .

  4. Cholesky decomposition - Wikipedia

    en.wikipedia.org/wiki/Cholesky_decomposition

    In linear algebra, the Cholesky decomposition or Cholesky factorization (pronounced / ʃ ə ˈ l ɛ s k i / shə-LES-kee) is a decomposition of a Hermitian, positive-definite matrix into the product of a lower triangular matrix and its conjugate transpose, which is useful for efficient numerical solutions, e.g., Monte Carlo simulations.

  5. Alveolar–arterial gradient - Wikipedia

    en.wikipedia.org/wiki/Alveolar–arterial_gradient

    hco 3 − = 24 p a co 2 = 40 p a o 2 = 95 ph = 7.40 alveolar gas: p a co 2 = 36 p a o 2 = 105 a-a g = 10 other: ca = 9.5 mg 2+ = 2.0 po 4 = 1 ck = 55 be = −0.36 ag = 16 serum osmolarity/renal: pmo = 300 pco = 295 pog = 5 bun:cr = 20 urinalysis: una + = 80 ucl − = 100 uag = 5 fena = 0.95 uk + = 25 usg = 1.01 ucr = 60 uo = 800 protein/gi ...

  6. Autocorrelation - Wikipedia

    en.wikipedia.org/wiki/Autocorrelation

    Autocorrelation, sometimes known as serial correlation in the discrete time case, is the correlation of a signal with a delayed copy of itself as a function of delay. Informally, it is the similarity between observations of a random variable as a function of the time lag between them.

  7. Covariance matrix - Wikipedia

    en.wikipedia.org/wiki/Covariance_matrix

    Throughout this article, boldfaced unsubscripted and are used to refer to random vectors, and Roman subscripted and are used to refer to scalar random variables.. If the entries in the column vector = (,, …,) are random variables, each with finite variance and expected value, then the covariance matrix is the matrix whose (,) entry is the covariance [1]: 177 ...

  8. Twelve-step program - Wikipedia

    en.wikipedia.org/wiki/Twelve-step_program

    Alcoholics Anonymous (AA), the first twelve-step fellowship, was founded in 1935 by Bill Wilson and Dr. Robert Holbrook Smith, known to AA members as "Bill W." and "Dr. Bob", in Akron, Ohio. In 1946 they formally established the twelve traditions to help deal with the issues of how various groups could relate and function as membership grew.