NO.PZ202208300200000401
问题如下：
Based on the results provided for the ALPHA model (Exhibit 1) and its associated documentation, the precision of the model is closest to:选项：
A.75.4%. B.85.5%. C.95.1%.解释：
SolutionC is correct. Precision (P) = TP/(TP + FP), where
TP = True positive = 5,290
FP = False positive = Type 1 error = 273
FN = False negative = Type 2 error = 894
P = 5,290/(5,290 + 273)
= 5,290/5,563
= 95.1%.
A is incorrect. The calculation incorrectly uses the total number of predictions in the denominator: 5,290/7,018 = 75.4%.
B is incorrect. The calculation uses the correct equation but incorrectly treats a Type 2 error as a false positive and a Type 1 error as a false negative:
P = TP/(TP + FP)
= 5,290/(5,290 + 894)
= 5,290/6,184
= 85.5%.
为什么FP是273，FP=294啊？我看了半天表格，也没看出来是哪里说了啊？
