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  2. Instrumental variables estimation - Wikipedia

    en.wikipedia.org/wiki/Instrumental_variables...

    When X and the other unmeasured, causal variables collapsed into the e term are correlated, however, the OLS estimator is generally biased and inconsistent for β. In this case, it is valid to use the estimates to predict values of y given values of X, but the estimate does not recover the causal effect of X on y.

  3. X + Y sorting - Wikipedia

    en.wikipedia.org/wiki/X_+_Y_sorting

    The input to the + sorting problem consists of two finite collections of numbers and , of the same length.The problem's output is the collection of all pairs of a number from and a number from , arranged into sorted order by the sum of each pair. [1]

  4. Total least squares - Wikipedia

    en.wikipedia.org/wiki/Total_least_squares

    There are m observations in y and n parameters in β with m>n. X is a m×n matrix whose elements are either constants or functions of the independent variables, x. The weight matrix W is, ideally, the inverse of the variance-covariance matrix of the observations y. The independent variables are assumed to be error-free.

  5. Admittance parameters - Wikipedia

    en.wikipedia.org/wiki/Admittance_parameters

    where Y is an N × N matrix the elements of which can be indexed using conventional matrix notation. In general the elements of the Y-parameter matrix are complex numbers and functions of frequency. For a one-port network, the Y-matrix reduces to a single element, being the ordinary admittance measured between the two terminals.

  6. List of best-selling game consoles - Wikipedia

    en.wikipedia.org/wiki/List_of_best-selling_game...

    The Nintendo DS product line are the best-selling handheld consoles, selling 154.02 million units worldwide. The majority of sales came from the DS Lite at 93.86 million units. [5] A handheld game console is a lightweight device with a built-in screen, controls, speakers, [6] and has greater portability than a standard video game console. [2]

  7. Advanced life support - Wikipedia

    en.wikipedia.org/wiki/Advanced_life_support

    An advanced life support paramedic unit of Palm Beach County Fire-Rescue used for EMS in Palm Beach County, Florida.. Advanced Life Support (ALS) is a set of life saving protocols and skills that extend basic life support to further support the circulation and provide an open airway and adequate ventilation (breathing).

  8. Darcy's law for multiphase flow - Wikipedia

    en.wikipedia.org/wiki/Darcy's_law_for_multiphase...

    A result of this is that above versions of the equations do not need any unit conversion constants. The petroleum industry applies a variety of units, of which a least two have some prevalence. If you want to apply units other than SI units, you must establish correct unit conversion constants for the multiphase flow equations.

  9. Pokémon (video game series) - Wikipedia

    en.wikipedia.org/wiki/Pokémon_(video_game_series)

    On January 8, 2013, Satoru Iwata announced the sixth generation of Pokémon, with the new paired games, Pokémon X and Y, which were released on the Nintendo 3DS on October 12, 2013, worldwide. [43] The X and Y games are rendered in full 3D; [44] however, only select parts of the game can be displayed in stereoscopic 3D. [45]