Data Mining for Material Feeding Optimization of Printed Circuit Board Template Production

Algorithm 1

Multivariate boxplot-based outlier detection of scrap rate.

Input:   samples; categorical variable set

Output: Outlier frequency for each sample

Initialize:

for    do

set as the values of feature

Plot a boxplot of scrap rate for each values in , and detect samples with scrap rate out of

for each boxplot; and outlier frequency of these samples are added by 1.

End for

Remove the samples corresponding to with , . Return