# Accessing the results

Once the estimate is done (via the classic `estimateParameters` method), the results can be accessed by calling three methods, detailed below. 
All three functions share the same prototype: they take no arguments and return a
`TMatrixD` instance containing the corresponding information. The functions are:

- **getParameterValueMatrix**: it returns a `TMatrixD` with one raw filled with the calibrated values of the parameters calculated from the 
analytical formula (one-dimensional);

- **getParameterCovarianceMatrix**: it returns a `TMatrixD` filled with the covariance matrix of the estimated parameters (symmetric and ($nPar$, $nPar$)-dimensional);

- **getTransfParameterValueMatrix**: it returns a `TMatrixD` with one raw filled with the transformed values of the parameters, in 
case `setParameterTransformationFunction` has been correctly applied (one-dimensional).