The calculations of the pharmacovigilance measurements of disproportionality have been successfully validated against R/epiR.

A free online statistical calculator for a contingency table that has 2 rows and 2 columns for the two categorial data to be analyzed. This software is especially designed for pharmacovigilance data but might be useful for other data as well.

Capabilities:

- rates,
- Chi-squared values corrected as recommended by Yates (chisq),
- basic statistical measurements of disproportionality for like RRR, ROR, PRR and diagnostic statistic's measurements like Likelihood Ratios (LR+,LR-) and Pos/Neg Predictive Values
- optional correction for real-world background,

(e.g., prevalence data of drug usage or event/disease occurrence in the common population),under-reportingand confounders/tied values for number of records.