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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.)

FrequencyTable

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 intervalclass markabsolute frequencyrelative frequencycumulative absolute frequencyrelative cumulative frequency
0.00- 9.99510.0110.01
10.00-19.991530.0340.04
20.00-29.992580.08120.12
30.00-39.9935180.18300.30
40.00-49.9945240.24540.54
50.00-59.9955220.22760.76
60.00-69.9965150.15910.91
70.00-79.997580.08990.99
80.00-89.998500.00990.99
90.00-99.999510.011001.00

See also

Characteristic Class, Class Boundaries, Class Interval, Class Limits, Class Mark, Class Number, Conjugacy Class, Frequency Distribution, Multiperfect Number Class, Set Class

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References

Kenney, J. F. and Keeping, E. S. Mathematics of Statistics, Pt. 1, 3rd ed. Princeton, NJ: Van Nostrand, 1962.

Referenced on Wolfram|Alpha

Class

Cite this as:

Weisstein, Eric W. "Class." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Class.html

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