Grimes and Schulz developed a simple algorithm for distinguishing between a rate, ratio and proportion. The authors are from Family Health International in Research Triangle Park (Raleigh-Durham), North Carolina.
Questions:
(1) Is the numerator included in the denominator?
(2) Is time included in the denominator?
Numerator in Denominator
Time in Denominator
Calculation
no
NA
ratio
yes
no
proportion
yes
yes
rate
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