reparametrizations {logcondens} | R Documentation |
Changes Between Parametrizations
Description
Given a vector (\phi_1, \ldots, \phi_m)
representing the values of a piecewise linear concave function at
x_1, \ldots, x_m,
etaphi
returns a column vector with the entries
{\bold{\eta}} = \Bigl(\phi_1, \Bigl(\eta_1 + \sum_{j=2}^m (x_i-x_{i-1})\eta_i\Bigr)_{i=2}^m\Bigr).
The function phieta
returns a vector with the entries
{\bold{\phi}} = \Bigl(\eta_1, \Bigl(\frac{\phi_i-\phi_{i-1}}{x_i-x_{i-1}}\Bigr)_{i=2}^m\Bigr).
Usage
etaphi(x, eta)
phieta(x, phi)
Arguments
x |
Vector of independent and identically distributed numbers, with strictly increasing entries. |
eta |
Vector with entries |
phi |
Vector with entries |
Note
These functions are not intended to be invoked by the end user.
Author(s)
Kaspar Rufibach, kaspar.rufibach@gmail.com,
http://www.kasparrufibach.ch
Lutz Duembgen, duembgen@stat.unibe.ch,
https://www.imsv.unibe.ch/about_us/staff/prof_dr_duembgen_lutz/index_eng.html