19、市场篮子分析：数据编码与Apriori算法应用

市场篮子分析：数据编码与Apriori算法应用

1. 事务数据特征与数据编码

1.1 数据处理代码示例

在处理事务数据时，首先需要对数据进行排序和编码。以下是一段Python代码示例，用于对事务数据进行排序和编码：

# 2. sort items in alphabetical order
list_nondup_sort_items = sorted(list(set(list_dup_unsort_items)))

# initialize DataFrame with all elements having False value
# name the columns the elements of list_dup_unsort_items
manual_df = pandas.DataFrame(
    False, 
    index=range(len(ll)), 
    columns=list_dup_unsort_items
)

# change False to True if element is in individual transaction list
# each row is represents the contains of an individual transaction
# (sublist from the original list of lists)
for i in range(len(ll)):
    for j in ll[i]:
        manual_df.loc[i, j] = True

# return the True/False