根据WEKA下面的输出，加权平均数有一部分有数值，但另一部分有一个问号。對於TP Rate，雖然有兩個問號，但加權平均數仍能計算出來。STM_TA 和 UM_KRTN 行。但是，它没有计算精度、F-Measure和MCC。
=== Detailed Accuracy By Class ===
TP Rate FP Rate Precision Recall F-Measure MCC ROC Area PRC Area Class
0.714 0.000 1.000 0.714 0.833 0.845 1.000 1.000 MEA0072
0.818 0.001 0.818 0.818 0.818 0.817 0.999 0.913 MEA0095
0.885 0.001 0.958 0.885 0.920 0.920 1.000 0.983 MEA1061
1.000 0.001 0.981 1.000 0.990 0.990 1.000 0.999 MEA2087
0.846 0.001 0.846 0.846 0.846 0.845 1.000 0.965 MEA2098
0.938 0.001 0.938 0.938 0.938 0.937 1.000 0.968 MEA2099
0.971 0.001 0.943 0.971 0.957 0.956 0.999 0.973 MEB0079
0.917 0.000 1.000 0.917 0.957 0.957 1.000 1.000 MEE0075
1.000 0.001 0.967 1.000 0.983 0.983 1.000 1.000 MFT0001
0.930 0.001 0.976 0.930 0.952 0.952 0.999 0.967 MFT0002
1.000 0.000 1.000 1.000 1.000 1.000 1.000 1.000 MFT0003
1.000 0.000 1.000 1.000 1.000 1.000 1.000 1.000 MFT1001
0.944 0.002 0.850 0.944 0.895 0.895 1.000 0.986 MFT1002
1.000 0.000 1.000 1.000 1.000 1.000 1.000 1.000 MFT1003
1.000 0.001 0.975 1.000 0.987 0.987 1.000 0.999 MFT2001
1.000 0.000 1.000 1.000 1.000 1.000 1.000 1.000 MRA1002
1.000 0.000 1.000 1.000 1.000 1.000 1.000 1.000 MRA2125
1.000 0.001 0.984 1.000 0.992 0.992 1.000 1.000 MRA2127
? 0.000 ? ? ? ? ? ? STM_TA
0.786 0.051 0.793 0.786 0.790 0.737 0.948 0.818 STM_TL
0.547 0.106 0.553 0.547 0.550 0.443 0.848 0.588 STM_TT
0.000 0.000 ? 0.000 ? ? 0.894 0.064 STM_X
0.547 0.008 0.806 0.547 0.652 0.649 0.978 0.762 UM_KK
0.864 0.082 0.787 0.864 0.824 0.760 0.941 0.815 UM_KRK
? 0.000 ? ? ? ? ? ? UM_KRTN
Weighted Avg. 0.797 0.053 ? 0.797 ? ? 0.943 0.816
=== Confusion Matrix ===
a b c d e f g h i j k l m n o p q r s t u v w x y <-- classified as
5 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 | a = MEA0072
0 9 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | b = MEA0095
0 0 23 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 | c = MEA1061
0 0 0 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | d = MEA2087
0 2 0 0 11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | e = MEA2098
0 0 0 0 1 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | f = MEA2099
0 0 0 0 0 0 33 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | g = MEB0079
0 0 0 0 0 0 0 11 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 | h = MEE0075
0 0 0 0 0 0 0 0 29 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | i = MFT0001
0 0 0 1 0 0 2 0 0 40 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | j = MFT0002
0 0 0 0 0 0 0 0 0 0 23 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | k = MFT0003
0 0 0 0 0 0 0 0 0 0 0 45 0 0 0 0 0 0 0 0 0 0 0 0 0 | l = MFT1001
0 0 1 0 0 0 0 0 0 0 0 0 17 0 0 0 0 0 0 0 0 0 0 0 0 | m = MFT1002
0 0 0 0 0 0 0 0 0 0 0 0 0 16 0 0 0 0 0 0 0 0 0 0 0 | n = MFT1003
0 0 0 0 0 0 0 0 0 0 0 0 0 0 39 0 0 0 0 0 0 0 0 0 0 | o = MFT2001
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 55 0 0 0 0 0 0 0 0 0 | p = MRA1002
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 58 0 0 0 0 0 0 0 0 | q = MRA2125
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 61 0 0 0 0 0 0 0 | r = MRA2127
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | s = STM_TA
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 302 70 0 2 10 0 | t = STM_TL
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51 204 0 12 106 0 | u = STM_TT
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 0 0 1 0 | v = STM_X
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 45 0 58 0 0 | w = UM_KK
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 25 43 0 0 433 0 | x = UM_KRK
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | y = UM_KRTN
我在网上搜索了一下，但没有找到加权平均值处的问号的答案。我希望谁能帮我解释一下，为什么有些计算出来了，有些却没有计算出来？
谢谢大家
(未确定的)值在传播。注意在上面的行中，你有一些值也是? 注意你有一些没有实例被归入的类。