被同學(xué)
2020-11-21 15:492020 Mock Exam B - Morning Session 第10題： 10 Using Exhibit 3 and Quinn’s reminder, the most appropriate measure of the accuracy of the model is: A 0.79. B 0.86. C 0.92. 文字描述： After running his model on the test set, Quinn produces a confusion matrix for evaluating the performance of the model (Exhibit 3). He reminds Wu that since the number of defaults in the dataset is likely much smaller than the number of non-defaults, this needs to be considered in evaluating model performance. ——通過(guò)這段文字，怎么能判斷出題人要我用FIscore算， 而不是用Accurancy算？？
所屬：CFA Level II > Quantitative Methods 視頻位置 相關(guān)試題
來(lái)源： 視頻位置 相關(guān)試題
1個(gè)回答
Kevin助教
2020-11-23 09:13
該回答已被題主采納
同學(xué)你好！
這個(gè)需要判斷。
F1 score is more appropriate (than accuracy) when unequal class distribution is in the dataset and it is necessary to measure the equilibrium of precision and recall.
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追問(wèn)
這是什么知識(shí)點(diǎn)，能用中文說(shuō)一遍嗎？
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追答
同學(xué)你好！
當(dāng)數(shù)據(jù)分布不均勻，需要同時(shí)考慮precision和recall，F(xiàn)1 score比accuracy更適合。
本題中，number of defaults in the dataset is likely much smaller than the number of non-defaults，因此符合這個(gè)標(biāo)準(zhǔn)。
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