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呵呵,stepwise只是regression model中variable selection 的一种,还有backward,forward,各有各的益处.
price analyst觉得更可能是focus on price elasicity of demand model, 还有要算optimal price, 如何完成profit 最佳化.
面试得多都问 price elasticity和marginal revenue, marginal cost,total revenue他们的瓜葛.
集体教训,假如会用数学办法推导他们的瓜葛,90%以上会录取你.
Good luck. |
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