1. A method for modeling an investment significant parameter of a financial instrument, using a computer, the method comprising the steps of: a) providing at least one series of historical bid prices of the financial instrument or historical ask prices of the financial instrument; b) selecting a financial model type having at least one variable parameter; c) initializing the at least one variable parameter of the selected financial model type; and d) applying the at least one series of historical bid prices or historical ask prices to the initialized financial model type to estimate the at least one variable parameter.