proporsi peserta didik kelompok bawah yang menjawab salah salah butir tes (perbandingan antara jumlah jawaban benar yang diberikan oleh kelompok bawah dengan jumlah peserta didik kelompok bawah)
the proportion of students who answered one group under one item test (comparison between the number of correct answers given by the group under the number of groups of learners down)
the proportion of students who answered the wrong group of test items (comparison between the number of correct answers given by group bottom with the number of learners group below)