PhecapSurrogate

a character scalar or vector consisting of variable names.
If a vector is given, the value of the surrogate is defined as the sum of
the values of each variable.

variable_names

a numeric scalar. If the surrogate value of a patient is less than or equal to this cutoff,
then this patient is treated as a control in SAFE.

lower_cutoff

a numeric scalar. If the surrogate value of a patient is greater than or equal to this cutoff,
then this patient is treated as a case in SAFE.

upper_cutoff

Define a surrogate varible from existing features, and specify
associated lower and upper cutoffs.

Implement surrogate-assisted feature extraction (SAFE) and
common machine learning approaches to train and validate phenotyping models.
Background and details about the methods can be found at
Zhang et al. (2019) <doi:10.1038/s41596-019-0227-6>,
Yu et al. (2017) <doi:10.1093/jamia/ocw135>, and
Liao et al. (2015) <doi:10.1136/bmj.h1885>.

PhecapSurrogate: Define a Surrogate Variable used in Surrogate-Assisted Feature Extraction (SAFE)

Description

Usage

Arguments

Value

Details

See Also