print_mfp_step

print_mfp_pvalue_step

print_mfp_ic_step

Function for verbose printing of function selection procedure (FSP)

Multivariable fractional polynomial algorithm simultaneously selects variables and functional forms in both generalized linear models and Cox proportional hazard models. Key references for this algorithm are Royston and Altman (1994)<doi:10.2307/2986270> and Sauerbrei and Royston (2008, ISBN:978-0-470-02842-1). In addition, it can model a 'sigmoid' relationship between variable x and an outcome variable y using the approximate cumulative distribution transformation proposed by Royston (2014) <doi:10.1177/1536867X1401400206>. This feature distinguishes it from a standard fractional polynomial function, which lacks the ability to achieve such modeling.

Edwin Kipruto

mfp2

Multivariable Fractional Polynomial Models with Extensions

Michael Kammer

Patrick Royston

Willi Sauerbrei

print_mfp_step function

<dl><dt>xi</dt>
<dd>a character string indicating the name of the current variable
of interest, for which the best fractional polynomial transformation is
to be estimated in the current step.</dd>
<dt>criterion</dt>
<dd>a character string defining the criterion used to select
variables and FP models of different degrees.</dd>
<dt>fit</dt>
<dd>intermediary model fit in <code>mfp_step</code>.</dd></dl>

Arguments

<ul>
<li><code>print_mfp_pvalue_step()</code>: Helper for verbose printing based on p-value.</li>
<li><code>print_mfp_ic_step()</code>: Helper for verbose printing based on information criterion.</li>
</ul>

Functions

Function for verbose printing of function selection procedure (FSP) — print_mfp_step

<dl>

<dt>xi</dt>
<dd>a character string indicating the name of the current variable
of interest, for which the best fractional polynomial transformation is
to be estimated in the current step.</dd>


<dt>criterion</dt>
<dd>a character string defining the criterion used to select
variables and FP models of different degrees.</dd>


<dt>fit</dt>
<dd>intermediary model fit in <code>mfp_step</code>.</dd>

</dl>

print_mfp_step: Function for verbose printing of function selection procedure (FSP)

Description

Usage

Arguments

Functions