Deltamatrix computes the Delta matrix, along with maximal
intersection intervals, for a set of intervals.
two-column matrix, each row of which stores an censoring interval of the form (Li, Ri]. If Li = Ri, it is an exact observation.
An intersection interval is a nonempty intersection of any combination of the given intervals, and a maximal intersection interval is an intersection interval that contains no other intersection interval.
The Delta matrix is a matrix of indicators (
FALSE). The rows correspond to the given interval-censored
observations, and the columns the maximal intersection intervals. A
TRUE value of the (i,j)-th element means that the i-th
observation covers the j-th maximal intersection interval, and a
FALSE value means the opposite.
A list with components:
left endpoints of the maximal intersection intervals.
right endpoints of the maximal intersection intervals.
logical matrix, for the Delta matrix.
Yong Wang <[email protected]>
Wang, Y. (2008). Dimension-reduced nonparametric maximum likelihood computation for interval-censored data. Computational Statistics & Data Analysis, 52, 2388-2402.
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