1. A method for calibrating a turbidity sensor in a domestic appliance, with the aid of reference values comprising the following steps: determining a plurality of measured values in at least one cleaning program sequence executed by a computer, the cleaning program sequence having a plurality of sequential time positions at which measured values can be determined, the plurality of measured values including at least two measured values being from the same time position within the program sequence; calculating, using a program executed by the computer, at least one measured value by at least one of statistical methods and probability calculus for omission from the following step; determining at least one possible reference value for calibrating the sensor from the non-selected measured values; and selecting an optimal reference value from the least one possible reference value if more than two possible reference values have been determined.