The implemented rules enable the calculation of posterior probabilities from given probabilistic relations. The main rules are the product and marginalization rule. The evolved version of BayesCalc incorporates additional features such as decision theory and hypothesis testing.
The previous version of BayesCalc dealt with symbolic calculations. Unfortunately, problems arise with some symbolic operations. Especially integrations are difficult. To overcome this problem, numerical versions of many operations were added to the package. With these numerical operations, results can still be obtained when the symbolic calculations break down.