phi_func

Internal function to perform the transformations for data types.

internal

An implementation of methods presented by Spiegelhalter (2005) <doi:10.1002/sim.1970> Funnel plots for comparing institutional performance, for standardised ratios, ratios of counts and proportions with additive overdispersion adjustment.

Chris Mainey

FunnelPlotR

Funnel Plots for Comparing Institutional Performance

Andrew Johnson

Matthew Bass

NHS-R Community 

phi_func function

<dl><dt>n</dt>
<dd>Single numeric value for the count of the number of groups (and therefore z-scores)</dd>
<dt>zscores</dt>
<dd>Vector of z-scores z-scores to be used. Commonly, this would be 'winsorised' first to remove impact of extreme outliers. SHMI truncates instead, but this simply reduced the n as well as the z-score.</dd></dl>

Arguments

Calculate overdispersion ratio — phi_func

<dl>

<dt>n</dt>
<dd>Single numeric value for the count of the number of groups (and therefore z-scores)</dd>


<dt>zscores</dt>
<dd>Vector of z-scores z-scores to be used. Commonly, this would be 'winsorised' first to remove impact of extreme outliers. SHMI truncates instead, but this simply reduced the n as well as the z-score.</dd>

</dl>

phi_func: Calculate overdispersion ratio

Description

Usage

Value

Arguments