Class
المؤلف:
Kenney, J. F. and Keeping, E. S
المصدر:
Mathematics of Statistics, Pt. 1, 3rd ed. Princeton, NJ: Van Nostrand, 1962.
الجزء والصفحة:
...
6-2-2021
1639
Class
The word "class" has many specialized meanings in mathematics in which it refers to a group of objects with some common property (e.g., characteristic class or conjugacy class.)
In statistics, a class is a grouping of values by which data is binned for computation of a frequency distribution (Kenney and Keeping 1962, p. 14). The range of values of a given class is called a class interval, the boundaries of an interval are called class limits, and the middle of a class interval is called the class mark.
The following table summarizes the classes illustrated in the histogram above for an example data set.
| class interval |
class mark |
absolute frequency |
relative frequency |
cumulative absolute frequency |
relative cumulative frequency |
| 0.00- 9.99 |
5 |
1 |
0.01 |
1 |
0.01 |
| 10.00-19.99 |
15 |
3 |
0.03 |
4 |
0.04 |
| 20.00-29.99 |
25 |
8 |
0.08 |
12 |
0.12 |
| 30.00-39.99 |
35 |
18 |
0.18 |
30 |
0.30 |
| 40.00-49.99 |
45 |
24 |
0.24 |
54 |
0.54 |
| 50.00-59.99 |
55 |
22 |
0.22 |
76 |
0.76 |
| 60.00-69.99 |
65 |
15 |
0.15 |
91 |
0.91 |
| 70.00-79.99 |
75 |
8 |
0.08 |
99 |
0.99 |
| 80.00-89.99 |
85 |
0 |
0.00 |
99 |
0.99 |
| 90.00-99.99 |
95 |
1 |
0.01 |
100 |
1.00 |
REFERENCES:
Kenney, J. F. and Keeping, E. S. Mathematics of Statistics, Pt. 1, 3rd ed. Princeton, NJ: Van Nostrand, 1962.
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