Final answer:
Comparing infection rates from quarter one of this year to last year represents a retrospective analysis, which looks at past data to identify trends.
Step-by-step explanation:
When you compare your infection rate from quarter one of this year to quarter one of last year to identify your progress, this is an example of a retrospective analysis. A retrospective analysis involves looking back at events that have already occurred and gathering data from past records to identify trends or patterns. This contrasts with a prospective analysis, which is focused on potential future events. For the given scenario, the other options do not apply as well because formative and summative evaluations are more often associated with educational progress or project development, and comparative analysis could be seen as too broad a term without specifying the temporal context.