filter4dAn overview of Filtered Historical Simulation (FHS) By Giovanni Barone-Adesi & Kostas Giannopoulos. FHS is a scenario generating technique for speculative assets prices (risk factors).As verbs the difference between filtered and filtred is that filtered is past tense of filter while filtred is past tense of filtre. As an adjective filtered is with a filter e.g., a carette.