Abstract: A combined dataset is provided including (i) online process measurement data (OPMD), calculated process data derived from the OPMD or inline property data for liquid component(s) provided to the process from laboratory test results or an online analyzer (process measurement data), (ii) spectra data from online spectral analyzing a liquid product or offline spectra data from liquid product samples, and (iii) laboratory property data (LPD) of ?1 product property from the product samples. When the spectra data is online data the dataset includes the OPMD and the online spectra data is coincidentally collected with product samples for the LPD. When the spectra data is offline spectra data the OPMD is coincidentally collected with the product samples for the LPD and for the offline spectra data. Using a Multivariate Data Analysis algorithm, a hybrid mathematical analyzer model is generated from the dataset which predicts the product property(ies) from (i) and (ii).