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Explanations and Restrictions

These should be seen as the guiding principles or the helping factors associated with the data-set. Explanations help us in knowing and understanding the data better; on the other hand, restrictions narrow down our focus to what is being asked and what is to be extracted.

For example, the following are the final results of standard X. The students were tested in English, Hindi, Science, Math, Social Science, Drawing, Craft, PT and Scout-Guide. For a better presentation of the mark sheet, the scores in the first four subjects are consolidated into A1, the next three into A2 and last three into A3. The final score is the total of these three scores A1, A2 and A3. On the basis of the final score the students get their ranks. The table below gives the scores of the top eleven students of the class.
 
Name
Grade
Final Score
A1
A2
A3
Drawing
PT
Social service
Anana
A
725
282
217
226
80
81
69
Pankaj
B
864
310
87
267
85
86
92
 

 

Name
Grade
Final Score
A1
A2
A3
Drawing
PT
Social service
Vamshi
C
812
300
290
222
70
91
74
Ram
C
805
270
262
273
65
79
97
Shann
D
900
391
292
217
96
86
81
Saket
D
876
301
297
278
65
87
93
Mini
C
825
296
296
233
50
89
91
Rashi Singh
E
905
320
290
295
72
99
99
Parul
B
895
310
290
295
72
99
98
Rakesh Rathi
B
870
276
296
298
63
99
99
Gauri
C
888
361
270
257
82
78
92




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