h_first_fct_nested_in_second: Check Whether First Factor is Nested in Second Factor

In RobinCar2: ROBust INference for Covariate Adjustment in Randomized Clinical Trials

Check Whether First Factor is Nested in Second Factor

Description

This function checks whether one factor variable is nested in another in terms of their levels and the mapping of observations to these levels:

Usage

h_first_fct_nested_in_second(f1, f2)

Arguments

f1	A factor variable, supposed to be more fine grained than f2.
f2	A factor variable, supposed to be more coarse grained than f1.

Details

• Both factors must have the same length.

• The positions of NA values must be identical in both factors.

• After removing NA values, f1 must have at least as many observed levels as f2.

• The mapping of observations to levels must be consistent, meaning that each level in f1 corresponds to exactly one level in f2. On the other hand, multiple levels in f1 can map to the same level in f2.

Value

TRUE if f1 is nested in f2, FALSE otherwise.

RobinCar2 documentation built on Jan. 9, 2026, 9:06 a.m.