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Homework answers / question archive / Consider the data set of market basket transactions shown in following table: Customer ID Transaction ID Items Bought 1 0001 {a,d,e,f} 1 0024 {a,b,c} 2 0012 {b,d,e,f} 2 0031 {a,c,e} 3 0015 {b,d,f} 3 0022 {a,b} 4 0029 {a,b,c} 4 0040 {a,b,d,e} 5 0033 {e,b,d} 5 0038 {f,c,e} Compute the support(%) for itemsets {e}, {b, d}, and {b, d, e} by treating each transaction ID as a market basket

Consider the data set of market basket transactions shown in following table: Customer ID Transaction ID Items Bought 1 0001 {a,d,e,f} 1 0024 {a,b,c} 2 0012 {b,d,e,f} 2 0031 {a,c,e} 3 0015 {b,d,f} 3 0022 {a,b} 4 0029 {a,b,c} 4 0040 {a,b,d,e} 5 0033 {e,b,d} 5 0038 {f,c,e} Compute the support(%) for itemsets {e}, {b, d}, and {b, d, e} by treating each transaction ID as a market basket

Writing

  1. Consider the data set of market basket transactions shown in following table:

Customer ID

Transaction ID

Items Bought

1

0001

{a,d,e,f}

1

0024

{a,b,c}

2

0012

{b,d,e,f}

2

0031

{a,c,e}

3

0015

{b,d,f}

3

0022

{a,b}

4

0029

{a,b,c}

4

0040

{a,b,d,e}

5

0033

{e,b,d}

5

0038

{f,c,e}
  1. Compute the support(%) for itemsets {e}, {b, d}, and {b, d, e} by treating each transaction ID as a market basket.

 

  1. Use the results in part (a) to compute the confidence for the association rules {b,d} −→ {e} and {e} −→ {b,d}.
  1. Is confidence a symmetric measure or an asymmetric measure?
  2. Repeat part (a) by treating each customer ID as a market basket. Each item should be treated as a binary variable (1 if an item appears in at least one transaction bought by the customer, and 0 otherwise.)
  3. Use the results in part (d) to compute the confidence for the association rules {b, d} −→ {e} and {e} −→ {b, d}.

 

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