The Effective Statistician - in association with PSI

Why and how to show individual patients in your charts


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In our standard graphics, we usually present summary statistics only. The exception is the Kaplan-Meier plot showing also individual patients. Showing individual patients effectively tells us so much more about e.g. clusters, outliers, and extreme values. Join Benjamin and I while we dive deep into the following points:

  • Show uncertainty 
  • Show actual number of patients 
  • Give a feeling for the evidence 
  • Connect to the physicians seeing the individual patients 
  • Increase transparency 

How to create:

  • Spaghetti plot
  • Slope graph
  • Using jittering for categorical data or thickness based on numbers of patients 
  • Scatterplots
  • Animations over time 
  • Heat maps 
  • Bar charts with symbols for the patients 
  • Kaplan-Meier
  • Cumulative distribution function 
  • Waterfall plots 
  • Flowing data example of categorical data over time (find it here: https://flowingdata.com/2015/12/15/a-day-in-the-life-of-americans/)

Additional features:

  • Highlight the group means 
  • Making it interactive with hover over or filters or selections 
  • Sorting is crucial 
  • Combination with charts displaying group differences 

Solve problems: 

  • Unbalanced treatment groups 
  • Avoid over cluttered graphs
  • Time to read and explain complex graphs
  • Time needed to create complex graphs
  • Problems obscuring small but meaningful differences

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The Effective Statistician - in association with PSIBy Alexander Schacht and Benjamin Piske, biometricians, statisticians and leaders in the pharma industry

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