MedCalc 22.007 for windows download free

Hanley H (1986) Analysis of Crude Data.The P-value is the exact mid-P double sided P-value (Hanley, 1986). The P-value is obtained using the Chi 2-statistic.įor the confidence interval of the incidence rate ratio, MedCalc uses the 'Exact Poisson Method' given on page 172-174 of Sahai H, Khurshid A (1996). Computational detailsįor the confidence interval of the difference between two rates, MedCalc uses the 'Test based Method' given on page 169 of Sahai H, Khurshid A (1996). If the P-value is less than 0.05 it can be concluded that the ratio R1/R2 is significantly different from 1 (which is the case when the rates are equal).

The ratio of the two rates (the incidence rate ratio) R1/R2 with its 95% Confidence Interval and associated P-value.If the P-value is less than 0.05 it can be concluded that there is a statistical significant difference between the two rates. The difference between the two rates R2-R1 with its 95% Confidence Interval and associated P-value.The (incidence) rate in the two groups with their Poisson 95% Confidence Interval.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.Denominator: for example the total person-years for each group.Numerator: the observed number of events in each group.This form allows to compare the rates in two groups. 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.

MedCalc 22.007 for windows download free