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    Is there an established method of determining subgroups in a data set?

    I am trying to determine the growth rate of a set of tumors. Running my model on the whole data set gives me an r2 of 0.80. If I split the set of tumors into a "slow-growing" group and a "fast-growing" group and run the analysis, I get a greater r2 value. Obviously if I keep dividing the data...