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  2. 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

  3. 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:

  4. 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.

  5. Time preference - Wikipedia

    en.wikipedia.org/wiki/Time_preference

    Where is the discounted value, is the non-discounted value, is the discount rate, and is the delay. [18] This is one of the most common hyperbolic discounting functions used today, and is especially useful in comparing two discounting scenarios, as the k {\displaystyle k} parameter can be easily interpreted.

  6. Psychological statistics - Wikipedia

    en.wikipedia.org/wiki/Psychological_statistics

    Psychological statistics is application of formulas, theorems, numbers and laws to psychology. Statistical methods for psychology include development and application statistical theory and methods for modeling psychological data. These methods include psychometrics, factor analysis, experimental designs, and Bayesian statistics. The article ...

  7. List of cognitive biases - Wikipedia

    en.wikipedia.org/wiki/List_of_cognitive_biases

    A good example of this is a study showed that when making food choices for the coming week, 74% of participants chose fruit, whereas when the food choice was for the current day, 70% chose chocolate. Insensitivity to sample size , the tendency to under-expect variation in small samples.

  8. Politeness theory - Wikipedia

    en.wikipedia.org/wiki/Politeness_theory

    The study focused on art reviews in Lithuania in the early and mid-1970s and analyzed the different strategies used by the art reviewers as they attempted to critique pieces of art while maintaining their face as well as the face of the artists. [31] The study was able to identify face-saving acts and all four politeness strategies at work.

  9. Physiognomy - Wikipedia

    en.wikipedia.org/wiki/Physiognomy

    Physiognomy as a practice meets the contemporary definition of pseudoscience [1] [2] [3] and is regarded as such by academics because of its unsupported claims; popular belief in the practice of physiognomy is nonetheless still widespread and modern advances in artificial intelligence have sparked renewed interest in the field of study.