While arranging large amount of data (in statistics), they are grouped into different classes to get an idea of the distribution, and the range of such class of data is called the Class Interval.
Methods
Exclusive Method
When the lower limit is included, but the upper limit is excluded, then it is an exclusive class interval
Example - 150 U 153, 153 U 156.....etc are exclusive type of class intervals. In the class interval 150 - 153, 150 is included but 153 is excluded. Same way in the class interval 153 U 156 153 is included but 156 is excluded.
Inclusive Method:
When the lower and the upper class limit is included, then it is an inclusive class interval.
Example - 220 - 234, 235 - 249 ..... etc. are inclusive type of class intervals. In the class interval 220 - 234, 220 is included as well 234 is included. Usually in the case of discrete variable, inclusive types of class intervals are used.
Open End:
When any of the class left without giving boundary is known as Open ended class interval.
Example – 235 & Above, Greater than 325etc. are open end type of class intervals.
Unequal Class Interval
When the class intervals are constructed with different class widths, then it is an Unequal Class Interval
Example – 18-25, 26-40, 40-55 .. etc. are Unequal type of class intervals.
No comments:
Post a Comment