PartID  SurveyDate
12  12/1/12
12  6/8/12
12  12/15/11
12  5/29/11
13  12/15/12
13  6/20/12
13  12/7/11
13  6/15/11
14  11/28/12
14  6/1/12
14  1/1/12
14  6/30/11

Part_ID Clinic_date Test_result
1        12     12/1/12          0
2        12    11/30/12          1
3        12      7/1/12          0
4        12      4/1/12          1
5        12    11/15/11          0
6        12     6/15/11          1
7        12      6/5/11          0
8        12      4/1/11          1
9        12    10/15/10          0
10       12    10/13/10          1
11       12     7/15/10          0
12       13    11/30/12          1
13       13      7/1/12          1
14       13      4/1/12          0
15       13    11/15/11          0
16       13     6/15/11          1
17       13      6/5/11          1
18       13      4/1/11          0
19       13    10/15/10          0
20       13    10/13/10          1
21       13     7/15/10          1
22       14    11/30/12          0
23       14      7/1/12          0
24       14      4/1/12          1
25       14    11/15/11          0
26       14     6/15/11          1
27       14      6/5/11          0