问题描述：
itemtotal correlation什么意思
Those items with an itemtotal correlation of more than 0.30 and a reasonably high variance in response (standard deviation of more than 0.40) were retained 为具体语境
Those items with an itemtotal correlation of more than 0.30 and a reasonably high variance in response (standard deviation of more than 0.40) were retained 为具体语境
问题解答：
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