Session 3/12/15 Summary Report : cs 4786

Date 3/12/15
Number of Students: 40
Total Questions: 7
Total Points Available: 8
Session Average: 2.98
Questions Asked: 10
Questions Deleted: 3
Participation Points Available: 1
Performance Points Available: 7
AP = Anonymous Polling.
Session Average = Average calculation based only on students who voted in this session.
Average Score per Question: Average calculation based only on students who responded to this question.
Question Title Time Started Time Stopped Number of
Responses		 Maximum
Score		 Average
Score
k* for k-means 10:22:03 AM 10:22:24 AM 32 1.00 0.41
k* for normalized cut 10:28:17 AM 10:28:45 AM 31 1.00 0.74
k* for single-link 10:31:23 AM 10:32:18 AM 30 1.00 0.40
best stopping adaptation of single link 10:45:36 AM 10:46:27 AM 31 1.00 0.52
which properties, fixed-k single link 10:47:16 AM 11:10:20 AM 6 1.00 0.17
which properties, distance-a single link 11:10:36 AM 11:11:55 AM 29 1.00 0.72
which properties, fixed-k means 11:13:28 AM 11:14:05 AM 26 1.00 0.23

k* for k-means

Correct Answer(s): D
Number of Responses: 32
Class Average: 0.41
Answer#%Performance
Points
A = 1 1 3% 0
B = 2 1 3% 0
C = n - 1 2 6% 0
D = n 13 41% 1
E I don't know 15 47% 0
 

k* for normalized cut

Correct Answer(s): A
Number of Responses: 31
Class Average: 0.74
 

k* for single-link

Correct Answer(s): B
Number of Responses: 30
Class Average: 0.40
 

best stopping adaptation of single link

Correct Answer(s): C
Number of Responses: 31
Class Average: 0.52
Answer#%Performance
Points
A when no cross-clusters pairs with distance >= alpha 2 6% 0
B [...ditto] with distance <=alpha*(max inter-pair dist) 10 32% 0
C One is good, the other has inequality direction flipped 16 52% 1
D Both would be good if inequality directions flipped 2 6% 0
E What is single-link clustering? 1 3% 0
 

which properties, fixed-k single link

Correct Answer(s): D
Number of Responses: 6
Class Average: 0.17
Answer#%Performance
Points
A just richness 0 0% 0
B just scale invariance 1 17% 0
C just consistency 2 33% 0
D exactly 2 1 17% 1
E all 3 2 33% 0
 

which properties, distance-a single link


Correct Answer(s): D
Number of Responses: 29
Class Average: 0.72
 

which properties, fixed-k means

Correct Answer(s): D
Number of Responses: 26
Class Average: 0.23