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  2. Lewin's equation - Wikipedia

    en.wikipedia.org/wiki/Lewin's_equation

    Lewin's emphasis on the present state of the life space did not preclude the idea that an individual's past may impact the present state of the life space: "[The] influence of the previous history is to be thought of as indirect in dynamic psychology: From the point of view of systematic causation, past events cannot influence present events.

  3. Present value - Wikipedia

    en.wikipedia.org/wiki/Present_value

    The present value of a perpetuity can be calculated by taking the limit of the above formula as n approaches infinity. =. Formula (2) can also be found by subtracting from (1) the present value of a perpetuity delayed n periods, or directly by summing the present value of the payments

  4. Prospect theory - Wikipedia

    en.wikipedia.org/wiki/Prospect_theory

    The value function that passes through the reference point is s-shaped and asymmetrical. The value function is steeper for losses than gains indicating that losses outweigh gains. Prospect theory stems from loss aversion, where the observation is that agents asymmetrically feel losses greater than that of an equivalent gain. It centralises ...

  5. Politeness theory - Wikipedia

    en.wikipedia.org/wiki/Politeness_theory

    Examples: excessively emotional expressions. The speaker indicates that he does not have the same values or fears as the hearer; Examples: disrespect, mention of topics which are inappropriate in general or in the context. The speaker indicates that he is willing to disregard the emotional well-being of the hearer. Examples: belittling or boasting.

  6. Time value of money - Wikipedia

    en.wikipedia.org/wiki/Time_value_of_money

    The present value formula is the core formula for the time value of money; each of the other formulas is derived from this formula. For example, the annuity formula is the sum of a series of present value calculations. The present value (PV) formula has four variables, each of which can be solved for by numerical methods:

  7. Validity (statistics) - Wikipedia

    en.wikipedia.org/wiki/Validity_(statistics)

    The validity of a measurement tool (for example, a test in education) is the degree to which the tool measures what it claims to measure. [3] Validity is based on the strength of a collection of different types of evidence (e.g. face validity, construct validity, etc.) described in greater detail below.

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  9. Net present value - Wikipedia

    en.wikipedia.org/wiki/Net_present_value

    Adjusted present value (APV): adjusted present value, is the net present value of a project if financed solely by ownership equity plus the present value of all the benefits of financing. Accounting rate of return (ARR): a ratio similar to IRR and MIRR; Cost-benefit analysis: which includes issues other than cash, such as time savings.