American Journal of Epidemiology 147:783-790. Then execute medcalcsetup32/64.msi and follow the instructions for the installation procedure. If you have previously installed MedCalc, you must close any open (running) copy of MedCalc first. Daly LE (1998) Confidence limits made easy: interval estimation using a substitution method. The MedCalc installation files are suitable for new installations only as well as software updates.

The 95% Confidence Interval for the incidence rate.The Poisson 95% Confidence Interval for the number counted (the Numerator).

the rate 10/200 equals 0.05 and can be represented as 1:20.

Option Express result as 1:X: when this option is selected the rate R will be displayed as 1:(1/R), e.g.

Option Express result as 1:X: when this option is selected the rate R will be displayed as 1: (1/R), e.g. Denominator: for example the total person-years.

Denominator: for example the total person-years. Numerator: the observed number of events.

Numerator: the observed number of events.

A rate is a ratio between a count and another measurement, for example the ratio of a number of events observed and the total number of person-years of observation.

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