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  2. Relative change - Wikipedia

    en.wikipedia.org/wiki/Relative_change

    Relative change. In any quantitative science, the terms relative change and relative difference are used to compare two quantities while taking into account the "sizes" of the things being compared, i.e. dividing by a standard or reference or starting value. [1] The comparison is expressed as a ratio and is a unitless number.

  3. Power law - Wikipedia

    en.wikipedia.org/wiki/Power_law

    To the right is the long tail, and to the left are the few that dominate (also known as the 80–20 rule ). In statistics, a power law is a functional relationship between two quantities, where a relative change in one quantity results in a relative change in the other quantity proportional to a power of the change, independent of the initial ...

  4. Fold change - Wikipedia

    en.wikipedia.org/wiki/Fold_change

    Fold change. Fold change is a measure describing how much a quantity changes between an original and a subsequent measurement. It is defined as the ratio between the two quantities; for quantities A and B the fold change of B with respect to A is B / A. In other words, a change from 30 to 60 is defined as a fold-change of 2.

  5. Change of basis - Wikipedia

    en.wikipedia.org/wiki/Change_of_basis

    A change of bases is defined by an m×m change-of-basis matrix P for V, and an n×n change-of-basis matrix Q for W. On the "new" bases, the matrix of T is . This is a straightforward consequence of the change-of-basis formula. Endomorphisms. Endomorphisms, are linear maps from a vector space V to itself. For a change of basis, the formula of ...

  6. Formula for change - Wikipedia

    en.wikipedia.org/wiki/Formula_for_change

    The formula for change, or the change formula' provides a model to assess the relative strengths affecting the likely success of organisational change programs.The formula was created by David Gleicher while he was working at management consultants Arthur D. Little in the early 1960s, refined by Kathie Dannemiller in the 1980s, and further developed by Steve Cady.

  7. Mass in special relativity - Wikipedia

    en.wikipedia.org/wiki/Mass_in_special_relativity

    The term mass in special relativity usually refers to the rest mass of the object, which is the Newtonian mass as measured by an observer moving along with the object. The invariant mass is another name for the rest mass of single particles. The more general invariant mass (calculated with a more complicated formula) loosely corresponds to the ...

  8. Related rates - Wikipedia

    en.wikipedia.org/wiki/Related_rates

    describes the relationship between x, y and h, for a right triangle. Differentiating both sides of this equation with respect to time, t, yields. Step 3: When solved for the wanted rate of change, dy / dt, gives us. Step 4 & 5: Using the variables from step 1 gives us: Solving for y using the Pythagorean Theorem gives:

  9. List of price index formulas - Wikipedia

    en.wikipedia.org/wiki/List_of_price_index_formulas

    Price index numbers are usually defined either in terms of (actual or hypothetical) expenditures (expenditure = price * quantity) or as different weighted averages of price relatives ( ). These tell the relative change of the price in question. Two of the most commonly used price index formulae were defined by German economists and ...