## How to Visualize Numerical Variables

• To Visualize Numerical Variables we use the following
• Frequency Distribution Tables
• Histograms
• Consider the following dataset with each numerical variable appearing only once • It makes more sense to group the numerical data into intervals
• Generally statisticians prefer 5 to 20 intervals, but it depends on volume of the data
• The formula for interval width
``````(largest number - smallest number)/number of desired intervals
``````
• Then according to convience we can round the interval width
• A number is included in an interval if that number
• Greater than lower bound
• is lower and equal to upper bound
• The frequency distribution table will be as shown below • Histograms:
• These are one of the most common ways to reprsent numerical data.
• Each bar has width of the interval. ## Exercise: Represent the Frequency Distribution table and histogram for the following data

• Refer Here for the excel with dataset

• Frequency Distribution Table: • Histogram ## Two Variable Relationships

• Till now we have been dealing with single variables (Categorical and numerical variables)
• Now lets try to focus on how to visualize relationship between two variables
• For this lets start with categorical variables
• Cross Tables (Contingency tables):
• These are used to represent categorical variables.
• One set of categories is labelling the rows and other set is labelling the columns • Side by Side Bar Chart: A common way to represent data from a cross table is by using a side by side bar chart • Refer Here for the excel sheet
• When we want to represent relationship between two numerical variables in the same graph, we usually use a scatter plot This site uses Akismet to reduce spam. Learn how your comment data is processed. 