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Statistics in Medicine
Article . 2018 . Peer-reviewed
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Statistics in Medicine
Article
License: CC BY
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The STRAND Chart: A survival time control chart

The STRAND chart: a survival time control chart
Authors: Olivia AJ Grigg;

The STRAND Chart: A survival time control chart

Abstract

The STRAND Chart (Survival Time, Risk‐Adjusted, N‐Division Chart) is a new tool for online risk‐adjusted (RA) monitoring of survival outcomes. The chart is drawn in continuous time, making it responsive to change in the process of interest, for example, performance over time of a surgical unit and the procedures that they employ. Though it is difficult to achieve with charts designed for the purpose described, we show that our suggested chart keeps patient ordering intact. We discuss the difficulties maintaining patient ordering poses, making reference to other charts in the literature. Our conclusion is that the best approach to preserving patient ordering on any chart of this nature involves compromising on the fullness of presentation of the recorded data. The chart is divided intoNstrands, each strand relating to a benchmark patient's survival information attndays following treatment,n = 1,2,…,N. We present a simple version of the chart where the strands consist of Bernoulli RA exponentially weighted moving averages, recording RA failure rates attndays. It can detect recent process changeandhistorical change. We illustrate the STRAND Chart using a well‐known UK post cardiac surgery survival dataset, where the nature of a certain cluster in the data can be seen.

Related Organizations
Keywords

Databases, Factual, control chart, survival, Survival Analysis, United Kingdom, Applications of statistics to biology and medical sciences; meta analysis, Time, Binomial Distribution, risk adjustment, performance monitoring, Humans, Computer Simulation, Risk Adjustment, quality control, Cardiac Surgical Procedures, Research Articles

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    popularity
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    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
9
Top 10%
Average
Average
Green
hybrid