UQuadraticDistribuionAbout

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About_pages_for_SOCR_Distributions - U-Quadratic Distribution

Description

The U quadratic distribution is defined by the following density function

 f(x)=\alpha \left ( x - \beta \right )^2, \forall x \in [a , b], a < b,

where the relation between the two pairs of parameters (domain-support, a and b) and (range/offset α and β) are given by the following two equations

(gravitational balance center) \beta = {b+a \over 2}, and
(vertical scale) \alpha = {12 \over \left ( b-a \right )^3}.

More information about U-quadratic, and other continuous distribution functions, is available at Wikipedia.

Properties

  • Support Parameters: a < b \in (-\infty,\infty)
  • Scale/Offset Parameters: \alpha \in (0,\infty) and \beta \in (-\infty,\infty)
  • PDF: f(x)=\alpha \left ( x - \beta \right )^2, \forall x \in [a , b]
  • CDF F(x)={\alpha \over 3} \left ( (x - \beta)^3 + (\beta - a)^3 \right ), \forall x \in [a , b]
  • Mean: {a+b \over 2}
  • Median: {a+b \over 2}
  • Modes: a and b
  • Variance:  {3 \over 20} (b-a)^2
  • Skewness: 0 (distribution is symmetric around the mean)
  • Kurtosis:  {3 \over 112} (b-a)^4

Interactive U Quadratic Distribution

You can see the interactive U Quadratic distribution by going to SOCR Distributions and selecting from the drop down list of distributions U Quadratic. Then follow the Help instructions to dynamically set parameters, compute critical and probability values using the mouse and keyboard.




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