1. An apparatus for processing a set of data values, a data value representing a physiological measure of a body fluid at a time instant, wherein the physiological measure is a blood glucose value, comprising: an estimated probability function calculator for calculating an estimated probability function associated with the set of data values; a transform calculator for calculating a non-linear transform rule using a predetermined target probability function being different from the estimated probability function and using the estimated probability function associated with the set of data values, so that the probability function of a set of transform data values is closer to the target probability function than the estimated probability function; a transformer for applying the transform rule to the set of data values or to at least one further data value not comprised by the set of data values and sampled at the different time instant from the time instants for the set of data values to acquire at least one transformed value representing the physiological measure; and a device for using the at least one transformed value for controlling a device for dosing a medicament in a closed or open loop configuration or for generating a visual, audible, tactile, mechanical, electro or magnetic indication of a medical characteristic of the body from which the set of data values or the further data value have been taken; wherein the transform calculator is configured for using a cumulative distribution function (CDF) as the target probability function, and in which the estimated probability function calculator is configured for calculating the CDF as the estimated probability function, wherein the transform calculator is configured for calculating a function value of the estimated CDF for an actual data value and for finding a transformed value, wherein the transformed value is selected by the transform calculator so that the function value of the estimated CDF is equal to the function value of the target CDF; and wherein at least one of the estimated probability function calculator, the transform calculator, and the transformer comprises a hardware implementation.