Open End Series
Sometimes the lower limit of the first class interval and the upper class limit of a series is not available; instead, Less than or Below is mentioned in the former case (in place of the lower limit of the first class interval), and More than or Above is mentioned in the latter case (in place of the upper limit of the last class interval). These types of series are known as Open End Series.
Example of Frequency Distribution in Open End Series
For statistical calculations, if one needs to change the first and last class open-end class interval into limits, it can be done by the general practice of giving the same magnitude or class size to these intervals as the class size of other class intervals. In the above example, the magnitude of other class intervals is 5. Therefore, the open-end class intervals can be written as 5-10 and 30-35, respectively.
Types of Frequency Distribution
It is not always possible for an investigator to easily measure the items of a series or set of data. To make the data simple and easy to read and analyze, the items of the series are placed within a range of values or limits. In other words, the given raw set of data is categorized into different classes with a range, known as Class Intervals. Every item of the given series is put against a class interval with the help of tally bars. The number of items occurring in the specific range or class interval is shown under Frequency against that particular class range to which the item belongs.
Table of Content
- Example of Frequency Distribution
- Types of Frequency Distribution
- 1. Exclusive Series
- 2. Inclusive Series
- 3. Open End Series
- 4. Cumulative Frequency Series
- 5. Mid-Value Frequency Series
- 6. Equal and Unequal Class Interval Series
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