Data Visualization: Scatter Plot

Scatter Plot

Scatter plot is a graph where in two variables are plotted against X and Y Axes. The plotted data might reveal the correlation between the two variables plotted.

 

Visual Look:

Scatter plots are similar to line graphs. The only difference is a line graph has a continuous line while a scatter plot has a series of dots. 

Primary goal:

This type of plot is used to identify relationship between the two variables. The relationship could indicate the following:

  • Strength
  • Shape – Linear, Curved, etc.,
  • Direction – Positive or Negative
  • Presence of Outliers

When do we use it?

  • When we need to understand the cause-and-effect relationship
  • When we need to understand the relationship between two variables.

Example scenarios:

  • Age and weight
  • Variation in sales based on certain conditions (E.g., Temperature in the City, Event,etc.,)
  • Increase in adoption of telephones over the years

     

Example of Scatter Plot done in Excel:

Source Data:


Graph:

Source: http://mospi.nic.in/Mospi_New/upload/SYB2014/ch31.html

 

In the next post we will see how we can do the same with “R”.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s