Some density functions take a bipartite form. To illustrate, let us suppose is a continuous random variable,
, with pdf
where . We enter this as:
![[Graphics:Images/index_gr_5.gif]](Images/index_gr_5.gif)
This is known as the Inverse Triangular distribution, as is clear from a plot of , as illustrated in Fig.Ūd1.
![[Graphics:Images/index_gr_7.gif]](Images/index_gr_7.gif)
Fig. 1: The Inverse Triangular pdf, when (bold),
(plain),
(dashed)
Here is the cdf, :
![[Graphics:Images/index_gr_13.gif]](Images/index_gr_13.gif)
Note that the solution depends on whether or
. Figure 2 plots the cdf at the same three values of
used in Fig.1.
Fig. 2: The Inverse Triangular cdf, when (bold),
(plain),
(dashed)
mathStatica operates on bipartite distributions in the standard way. For instance, the mean is given by:
![[Graphics:Images/index_gr_23.gif]](Images/index_gr_23.gif)
while the entropy is given by :
![[Graphics:Images/index_gr_26.gif]](Images/index_gr_26.gif)