The number of times an observation occurs is called the frequency.
• Frequency is often denoted by the symbol ( f ).
Frequency Distribution
Frequency Distribution is a statistical table which shows the set of all distinct values of the variables arranged in order of magnitude with their corresponding frequencies side by side.
In other words, a tabular arrangement of data showing the frequency of each observations is called a frequency distribution.
There are two types of frequency distribution namely:
- Univariate frequency distribution
The frequency distributions showing only one variable are called univariate frequency distribution.
- Bivariate frequency distribution
The frequency distributions showing the analysis of the relationship between two variables simultaneously is called Bivariate frequency distribution.
In short, The frequency distribution involving two variables are called Bivariate frequency distribution.
i.) Univariate frequency distribution:
A univariate frequency distribution is further divided as follows:
1.) Individual series:
A series where items are listed individually rather than keeping in groups is called individual series.
• It is also known as arrayed series.
2.) Discrete series:
A series where items are arranged in a table showing the frequency with which each successive value of a discrete variable occurs is called discrete series.
• It is also known as ungrouped frequency distribution.
3.) Continuous series:
Continuous series refer to a type of data series where the data points or observations represent a continuous range of values within specific intervals or classes.
• It is also known as grouped frequency distribution.
