Data quality · Analysis and reporting

Observation and Missingness by Group and Time

A measurement-availability heatmap retains original-cohort denominators across time and strategies.

Download SVG Open code and full worked example

When to use it

Use to describe who is measured and when, before assuming that absent records mean no event or no symptoms.

How to read it

Four rows show laboratory and PRO availability in A and B at months 0,3,6,12. Denominator is 100 original eligible people per strategy; missingness mechanisms are not identified by the heatmap.

Worked example

A measurement-availability heatmap retains original-cohort denominators across time and strategies.

Four rows show laboratory and PRO availability in A and B at months 0,3,6,12. Denominator is 100 original eligible people per strategy; missingness mechanisms are not identified by the heatmap.

Result: Use to describe who is measured and when, before assuming that absent records mean no event or no symptoms.

Produced by

Missing Data Pattern Table Informative Presence and Observation-Process Bias

Reference: Primary method sources are listed in the linked producing-method entries. The displayed data are original synthetic teaching examples, not published patient results.