In the framework of Multifractal Diffusion Entropy Analysis we propose a method for choosing an optimal bin-width in histograms generated from underlying probability distributions of interest. This presented method uses techniques of Renyi 's entropy and the mean square error analysis to discuss the conditions under which the error in Renyi's entropy estimation is minimal. We illustrate the utility of our method by focusing on a scaling behavior of financial time series. In particular, we analyze the S&P500 stock index as sampled at a daily rate in the time period 1950-2013. In order to demonstrate a strength of the optimality of the bin-width we compare the  \delta-spectrum for various bin-widths . Implications for the multifractal \delta-spectrum as a function of Renyi 's q parameter are also discussed and graphically represented .
In the framework of Multifractal Diffusion Entropy Analysis we propose a method for choosing an optimal bin-width in histograms generated from underlying probability distributions of interest. The method presented uses techniques of R\'{e 's entropy and the mean squared error analysis to discuss the conditions under which the error in the multifractal spectrum estimation is minimal. We illustrate the utility of our approach by focusing on a scaling behavior of financial time series. In particular, we analyze the S&P500 stock index as sampled at a daily rate in the time period 1950-2013. In order to demonstrate a strength of the method proposed we compare the multifractal \delta-spectrum for various bin-widths and show the robustness of the method, especially for large values of q. For such values, other methods in use, e.g., those based on moment estimation, tend to fail for heavy-tailed data or data with long correlations. Connection between the \delta-spectrum and R\'{e 's q parameter is also discussed and elucidated on a simple example of multiscale time series .
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