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  2. Second partial derivative test - Wikipedia

    en.wikipedia.org/wiki/Second_partial_derivative_test

    In cases 1 and 2, the requirement that f xx f yy − f xy 2 is positive at (x, y) implies that f xx and f yy have the same sign there. Therefore, the second condition, that f xx be greater (or less) than zero, could equivalently be that f yy or tr( H ) = f xx + f yy be greater (or less) than zero at that point.

  3. Blast Premier - Wikipedia

    en.wikipedia.org/wiki/BLAST_Premier

    Blast Premier (stylized as BLAST Premier) is a Counter-Strike 2 (CS2) (previously Counter-Strike: Global Offensive) professional esports league launched in 2020. It is primarily based in two regions: North America and Europe. The Danish esports organisation, RFRSH Entertainment, announced the series as a successor to the BLAST Pro Series in ...

  4. Rank correlation - Wikipedia

    en.wikipedia.org/wiki/Rank_correlation

    "One can derive a coefficient defined on X, the dichotomous variable, and Y, the ranking variable, which estimates Spearman's rho between X and Y in the same way that biserial r estimates Pearson's r between two normal variables” (p. 91). The rank-biserial correlation had been introduced nine years before by Edward Cureton (1956) as a measure ...

  5. Limit comparison test - Wikipedia

    en.wikipedia.org/wiki/Limit_comparison_test

    In mathematics, the limit comparison test (LCT) (in contrast with the related direct comparison test) is a method of testing for the convergence of an infinite series.

  6. Iterated limit - Wikipedia

    en.wikipedia.org/wiki/Iterated_limit

    In multivariable calculus, an iterated limit is a limit of a sequence or a limit of a function in the form , = (,), (,) = ((,)),or other similar forms. An iterated limit is only defined for an expression whose value depends on at least two variables. To evaluate such a limit, one takes the limiting process as one of the two variables approaches some number, getting an expression whose value ...

  7. Elo rating system - Wikipedia

    en.wikipedia.org/wiki/Elo_rating_system

    Since the standard deviation σ of individual performances is defined as 200 points, the standard deviation σ' of the differences in performances becomes σ√2 or 282.84. The z value of a difference then is D / 282.84. This will then divide the area under the curve into two parts, the larger giving P for the higher rated player and the ...

  8. Counter-Strike Major Championships - Wikipedia

    en.wikipedia.org/wiki/Counter-Strike_Major...

    The first Counter-Strike 2 Major was announced to be the PGL CS2 Major Copenhagen 2024 which was held from March 17–31 in the Royal Arena. [40] On November 12, 2023, Perfect World , who are responsible for distributing Counter-Strike 2 in China, announced the second major following the release of Counter-Strike 2 , taking place in Shanghai ...

  9. Somers' D - Wikipedia

    en.wikipedia.org/wiki/Somers'_D

    Somers’ D takes values between when all pairs of the variables disagree and when all pairs of the variables agree. Somers’ D is named after Robert H. Somers, who proposed it in 1962. [1] Somers’ D plays a central role in rank statistics and is the parameter behind many nonparametric methods. [2]