 Students / Subjects  Q ratio Or, "Tobin's Q". The ratio of the market value of a firm to the replacement cost of everything in the firm. In Tobin's model this was the driving force behind investment decisions. Source: econterms Q-statistic Of Ljung-Box. A test for higher-order serial correlation in residuals from a regression. Source: econterms QJE Quarterly Journal of Economics Source: econterms QLR quasi-likelihood ratio statistic Source: econterms QML Stands for quasi-maximum likelihood. Source: econterms quango Stands for quasi-non-governmental organization, such as the U.S. Federal Reserve. The term is British. Source: econterms quartic kernel The quartic kernel is this function: (15/16)(1-u2)2 for -1= min{f(x1), f(x2)}. Equivalently, f() is quasiconcave iff -f() is quasiconvex. Equivalently, f() is quasiconcave iff for any constant real k, the set of values x in the domain of f() for which f(x) >= k is a convex set. The most common use in economics is to say that a utility function is quasiconcave, meaning that in the relevant range it is nondecreasing. A function that is concave over some domain is also quasiconcave over that domain. (Proven in Chiang, p 390). A strictly quasiconcave utility function is equivalent to a strictly convex set of preferences, according to Brad Heim and Bruce Meyer (2001) p. 17. Source: econterms quasiconvex A function f(x) mapping from the reals to the reals is quasiconvex if it is nonincreasing for all values of x below some x0 and nondecreasing for all values of x above x0. x0 can be infinity or negative infinity: that is, a function that is everywhere nonincreasing or nondecreasing is quasiconvex. Quasiconvex functions have the property that for any two points in the domain, say x1 and x2, the value of f(x) on all points between them satisfies: f(x) <= max{f(x1), f(x2)}. Equivalently, f() is quasiconvex iff -f() is quasiconcave. Equivalently, f() is quasiconvex iff for any constant real k, the set of values x in the domain of f() for which f(x) <= k is a convex set. A function that is convex over some domain is also quasiconvex over that domain. (Proven in Chiang, p 390). Source: econterms