This applet is a calculator for the U-quadratic distribution on the interval \( [a, a + w] \). The calculator gives the value of the cumulative distribution function \(p = F(x)\) for a given value of \(x\), or the value of the quantile function \(x = F^{-1}(p)\) for a given value of \(p\). The paramters \( a \) and \( w \) can be varied with input controls, as can the variables \(x\) and \(p\).