| Deltamatrix {npsurv} | R Documentation |
Delta matrix
Description
Deltamatrix computes the Delta matrix, along with maximal
intersection intervals, for a set of intervals.
Usage
Deltamatrix(LR)
Arguments
LR |
two-column matrix, each row of which stores an censoring interval
of the form |
Details
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 (TRUE or 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.
Value
A list with components:
left |
left endpoints of the maximal intersection intervals. |
right |
right endpoints of the maximal intersection intervals. |
Delta |
logical matrix, for the Delta matrix. |
Author(s)
Yong Wang <yongwang@auckland.ac.nz>
References
Wang, Y. (2008). Dimension-reduced nonparametric maximum likelihood computation for interval-censored data. Computational Statistics & Data Analysis, 52, 2388-2402.
See Also
Examples
(x = cbind(1:5,1:5*3-2))
Deltamatrix(x)