Which statistical technique do you find indispensable for quant analytics?

Which statistical technique do you find indispensable for quant analytics? If you were allowed to equip your statistical tool belt with only one technique to perform data analysis, which one would it be and why?   == Scatterplots, Google Anscombe’s Quartet to see a famous example of why.   == After researching Anscombe’s Quartet, I …

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