initial_values {iclogcondist} | R Documentation |
Initial Values for Estimation under Log-concavity with Interval-Censored Data
Description
This function obtains initial values for the maximum likelihood estimation under log-concavity with interval-censored data based on the unconstrained maximum likelihood estimate (MLE) or its least concave majorant (LCM). Alternatively, the user can provide a numeric vector of initial values.
Usage
initial_values(X, initial = "LCM")
Arguments
X |
A matrix or data frame of interval-censored data, where each row contains the lower and upper bounds of the interval for each observation. |
initial |
A character string specifying the method for generating initial values.
The default is |
Value
A list containing:
- phi_hat
The initial values of the
phi
parameter based on the specified method.- phi_hat_MLE
Initial values based on the unconstrained MLE.
- phi_hat_LCM
Initial values based on the least concave majorant.