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  2. Mathematical model - Wikipedia

    en.wikipedia.org/wiki/Mathematical_model

    A mathematical model is an abstract description of a concrete system using ... engineers can build a descriptive model of the system as a hypothesis of how the system ...

  3. Descriptive statistics - Wikipedia

    en.wikipedia.org/wiki/Descriptive_statistics

    The use of descriptive and summary statistics has an extensive history and, indeed, the simple tabulation of populations and of economic data was the first way the topic of statistics appeared. More recently, a collection of summarisation techniques has been formulated under the heading of exploratory data analysis : an example of such a ...

  4. Descriptive research - Wikipedia

    en.wikipedia.org/wiki/Descriptive_research

    Descriptive science is a category of science that involves descriptive research; that is, observing, recording, describing, and classifying phenomena.Descriptive research is sometimes contrasted with hypothesis-driven research, which is focused on testing a particular hypothesis by means of experimentation.

  5. Decision theory - Wikipedia

    en.wikipedia.org/wiki/Decision_theory

    The mythological judgement of Paris required selecting from three incomparable alternatives (the goddesses shown).. Decision theory or the theory of rational choice is a branch of probability, economics, and analytic philosophy that uses the tools of expected utility and probability to model how individuals would behave rationally under uncertainty.

  6. Descriptive complexity theory - Wikipedia

    en.wikipedia.org/wiki/Descriptive_complexity_theory

    Descriptive complexity is a branch of computational complexity theory and of finite model theory that characterizes complexity classes by the type of logic needed to express the languages in them. For example, PH , the union of all complexity classes in the polynomial hierarchy, is precisely the class of languages expressible by statements of ...

  7. Exploratory data analysis - Wikipedia

    en.wikipedia.org/wiki/Exploratory_data_analysis

    The variables available in the data collected for this task are: the tip amount, total bill, payer gender, smoking/non-smoking section, time of day, day of the week, and size of the party. The primary analysis task is approached by fitting a regression model where the tip rate is the response variable. The fitted model is

  8. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Personality Assessment System - Wikipedia

    en.wikipedia.org/wiki/Personality_Assessment_System

    The Personality Assessment System (PAS) is a descriptive model of personality formulated by John W. Gittinger. The system has been used by scientists in studying personality and by clinicians in clinical practice.