get_Cox_sg

Fits a Cox model for a subgroup and returns estimate and standard error.

internal

Implements statistical methods for exploratory subgroup identification
in clinical trials with survival endpoints. Provides tools for identifying
patient subgroups with differential treatment effects using machine learning
approaches including Generalized Random Forests (GRF), LASSO regularization,
and exhaustive combinatorial search algorithms. Features bootstrap bias
correction using infinitesimal jackknife methods to address selection bias
in post-hoc analyses. Designed for clinical researchers conducting exploratory
subgroup analyses in randomized controlled trials, particularly for
multi-regional clinical trials (MRCT) requiring regional consistency
evaluation. Supports both accelerated failure time (AFT) and Cox proportional
hazards models with comprehensive diagnostic and visualization tools.
Methods are described in León et al. (2024) <doi:10.1002/sim.10163>.

Larry Leon

forestsearch

Exploratory Subgroup Identification in Clinical Trials with
Survival Endpoints

get_Cox_sg function

<dl><dt>df_sg</dt>
<dd>Data frame for subgroup.</dd>
<dt>cox.formula</dt>
<dd>Cox model formula.</dd>
<dt>est.loghr</dt>
<dd>Logical. Is estimate on log(HR) scale?</dd>
<dt>cox_initial</dt>
<dd>Optional pre-fitted Cox model object to use instead of
fitting a new model. Default NULL</dd></dl>

Arguments

Fit Cox Model for Subgroup — get_Cox_sg

<dl>

<dt>df_sg</dt>
<dd>Data frame for subgroup.</dd>


<dt>cox.formula</dt>
<dd>Cox model formula.</dd>


<dt>est.loghr</dt>
<dd>Logical. Is estimate on log(HR) scale?</dd>


<dt>cox_initial</dt>
<dd>Optional pre-fitted Cox model object to use instead of
fitting a new model. Default NULL</dd>

</dl>

get_Cox_sg: Fit Cox Model for Subgroup

Description

Usage

Value

Arguments

Details