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Can anyone inform me about the rules used by SPSS to build histograms (namely, how he chooses the number of classes and its limits). This question is about the automatic procedures used in Frequencies/Histogram, Graphs/Histogram and Interactive graphs/Histogram commands. Thank you very much. Luís Faísca Universidade do Algarve - FCHS Campus de Gambelas 8000-810 Faro Portugal