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2. Lotus 1-2-3 - Wikipedia

   en.wikipedia.org/wiki/Lotus_1-2-3

   Lotus 1-2-3 is a discontinued spreadsheet program from Lotus Software (later part of IBM).It was the first killer application of the IBM PC, was hugely popular in the 1980s, and significantly contributed to the success of IBM PC-compatibles in the business market.

3. Mallows's Cp - Wikipedia

   en.wikipedia.org/wiki/Mallows's_Cp

   In statistics, Mallows's, [1] [2] named for Colin Lingwood Mallows, is used to assess the fit of a regression model that has been estimated using ordinary least squares.It is applied in the context of model selection, where a number of predictor variables are available for predicting some outcome, and the goal is to find the best model involving a subset of these predictors.

4. Kt/V - Wikipedia

   en.wikipedia.org/wiki/Kt/V

   where C is the concentration [mol/m 3]; t is the time [s]; K is the clearance [m 3 /s]; V is the volume of distribution [m 3]; From the above definitions it follows that is the first derivative of concentration with respect to time, i.e. the change in concentration with time.

5. Duncan's new multiple range test - Wikipedia

   en.wikipedia.org/wiki/Duncan's_new_multiple_range...

   The new multiple range test proposed by Duncan makes use of special protection levels based upon degrees of freedom.Let , = be the protection level for testing the significance of a difference between two means; that is, the probability that a significant difference between two means will not be found if the population means are equal.

6. Vincenty's formulae - Wikipedia

   en.wikipedia.org/wiki/Vincenty's_formulae

   Online and downloadable PC-executable calculation utilities, including forward (direct) and inverse problems, in both two and three dimensions (accessed 2011-08-01). Online calculators with JavaScript source code by Chris Veness (Creative Commons Attribution license): Vincenty Direct (destination point) Vincenty Inverse (distance between points)

7. Equivalent annual cost - Wikipedia

   en.wikipedia.org/wiki/Equivalent_annual_cost

   In finance, the equivalent annual cost (EAC) is the cost per year of owning and operating an asset over its entire lifespan.It is calculated by dividing the negative NPV of a project by the "present value of annuity factor":

8. Heron's formula - Wikipedia

   en.wikipedia.org/wiki/Heron's_formula

   A triangle with sides a, b, and c. In geometry, Heron's formula (or Hero's formula) gives the area of a triangle in terms of the three side lengths ⁠, ⁠ ⁠, ⁠ ⁠. ⁠ Letting ⁠ ⁠ be the semiperimeter of the triangle, = (+ +), the area ⁠ ⁠ is [1]

9. Item response theory - Wikipedia

   en.wikipedia.org/wiki/Item_response_theory

   In psychometrics, item response theory (IRT, also known as latent trait theory, strong true score theory, or modern mental test theory) is a paradigm for the design, analysis, and scoring of tests, questionnaires, and similar instruments measuring abilities, attitudes, or other variables.