Frequency Table

It's very crucial to check the shape of distribution of the random variable, which is not easy to examine with the help of frequency diagram or table. Frequency table helps us display tally of numerous data observations on various categories.

In most cases of discrete quantitative data & qualitative data we use all the noted values of the categories. But, when there are huge number of various observations then consecutive observation might be grouped each other for forming the combined categories.

Frequency Table Examples

Example 1: For instance (growing coffee beans).

We could create the frequency table as shown below:

Frequency Table Example

We don't have to amalgamate them because we have only 10 categories.

But, when it comes to continuous data, selection of categories are more arbitrary as we normally apply 8 to 12 consecutive intervals that are non-overlapping of same width. Lesser than this might be good for smaller sample size and greater for bigger sample. Note that the intervals should cover the whole observed value range.

Example 2: Survival analysis

We've got the following table:

Frequency Table Sample

We need to define the intervals as same as the data. Hence, while the data is defined to the closer values or integers then the intervals need to as mentioned in the above table. On the other hand, intervals should be one decimal place while the data is defined. Again, while the data are rounded to its nearest integers then the intervals are normally 0-39.5, 39.5-79.5 so forth. It's also crucial to sum up sample size with table.

Latest Articles

Average Acceleration Calculator

Average acceleration is the object's change in speed for a specific given time period. ...

Free Fall Calculator

When an object falls into the ground due to planet's own gravitational force is known a...


In Mathematics, the permutation can be explained as the arrangement of objects in a particular order. It is an ordered...

Perimeter of Rectangle

A rectangle can be explained as a 4-sided quadrilateral which contains equal opposite sides. In a rectangle

Perimeter of Triangle

A three sided polygon which has three vertices and three angles is called a triangle. Equilateral triangle...