Figure 2 shows the fit of the regression model to the

hazard function.

The anticipated inverse relationship between asset size and the hazard of disappearance is evident in both of the

hazard function estimations, indicating that a smaller credit union was at significantly greater risk of disappearance through either acquisition or failure than a larger one.

It can be seen from Figure 2 that there is a factor of about four in the hazard range for the blue

hazard function over the wide range of color temperatures of the light sources shown, while for the lipofuscin function this range is reduced to about a factor of 2.

To model the

hazard functions for graduation after a given year in high school controlling for the effect of disability, I fitted a series of discrete-time hazard models (Singer & Willett, 2003).

13) The model is semi-parametric in the sense that the vector [beta] can be estimated without imposing any assumption on the baseline

hazard function.

Our specification follows Cox (1972); who assumes that

hazard function has a multiplicative form: h(t[x.

or the product of an unspecified baseline

hazard function [[lambda].

The maximum of the

hazard function is reached at the age of 21.

If we define the

hazard function as h(t, x, [beta]) [equivalent to] f(t, x, [beta])/S(t, x, [beta]), where S is the survivor function S(t, x, [beta]) = [[PI].

dry -1]) Greek Symbols [LAMBDA] cumulative

hazard function (unitless) [alpha] Weibull rate parameter (s) [beta] Weibull shape parameter (unitless) Subscripts TI time-independent TD time-dependent desorp relating to moisture desorption 1,2,3,4 subscripts delineating parameters

In the second plot, we add `state' to this

hazard function: this generates a family of

hazard functions.

Figure 1 presents the Kaplan-Meier

hazard function for new spells, by State.