Mid-Value Frequency Series
The series in which, instead of class intervals, their mid-values are given with the corresponding frequencies, is known as Mid-Value Frequency Series.
Conversion of Mid-Value Frequency Series into Simple Frequency Series
The steps to convert a mid-value frequency series into a simple frequency series are as follows:
- The first step is to determine the mutual difference between the mid-values.
- The next step is to obtain half of the resulting difference.
- The last step of conversion is to subtract the resulting figure from the second step from the mid-value to get the lower limit of the class interval, and add the resulting figure from the second step to the mid-value to get the upper limit.
m = Mid-Value
i = Difference between mid-values
Example of Frequency Distribution in Mid-Value Frequency Series
Convert the following Mid-Value Frequency Series into Simple Frequency Series.
Solution:
Calculation:
Difference between mid-values (i) = 10
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