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How can counts and rates tell different stories?

The situation

Fictional scenario

Returns rose from 10 to 12. Quality must have deteriorated.

How many items were delivered in each period, and are the return definition and observation windows comparable?

The count rose, but we need total deliveries before comparing the rates and percentage-point difference.

What is getting in the way

Separate fictional practice: 10 of 100 in period one and 12 of 200 in period two. The count rises while the rate falls. Both can be true without establishing quality or a measure’s causal effect.

Method and tool

Read counts, denominators and rates together

Check the population, period, units and definitions before interpreting the numbers. Example calculations do not establish causes or effects.

At a glance

Read counts, denominators and rates together

Read the numbers with their definitions
MeasureCheck
Period one qualifying countInteger count meeting the defined condition.
Period one totalThe denominator must be positive and at least the qualifying count.
Period two qualifying countRetain the same definition and observation rules.
Period two totalRecord the actual denominator for the count.
Definitions and limitsRecord scope, periods, denominators and mix differences.
Keep evidence gaps and unapproved arrangements explicit.
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