This makes it possible to estimate cross-promotion effects, even though these promotions are not directly observable, by imputing the level of competitive promotions. 這就使得通過(guò)輸入競爭性促銷(xiāo)水平來(lái)測量交叉促銷(xiāo)效果成為可能，即使這些促銷(xiāo)是無(wú)法直接觀(guān)測到的。
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