we show that this share varies significantly across space, with a mean of 0.63 and a cross-state standard deviation of 0.15 in the average product category.
请问cross-state standard deviation是什么类型的标准差?
average product category又该如何理解?
小弟初来乍到,对经济理论的皮毛尚且不知,还望各位多多指教。谢谢。



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