Types of Graphs and Charts

Bar graphs

Bar Graph Features Data is displayed either horizontally or vertically. Single bar graphs are used to convey discrete values of an item within a category.

• Bar Chart/Graph.
• Pie Chart.
• Line Graph or Chart.
• Histogram Chart.
• Area Chart.
• Dot Graph or Plot.
• Scatter Plot.
• Bubble Chart.

You would use:

1. Bar graphs to show numbers that are independent of each other.
2. Pie charts to show you how a whole is divided into different parts.
3. Line graphs show you how numbers have changed over time.
4. Cartesian graphs have numbers on both axes, which therefore allow you to show how changes in one thing affect another.

A graph is a diagram of a mathematical function, but can also be used (loosely) about a diagram of statistical data. A plot is the result of plotting statistics as a diagram in different ways, where some of the ways are similar to some chart types.

Common Types of Graphs

• Bar Graph.
• Segmented Bar Graph.
• Column Graph.
• Box and Whiskers Graph (also called a Box Plot)
• Frequency Graph (Frequency Table)
• Cumulative Frequency Table.
• Frequency Polygon.
• Histogram.

In discrete mathematics, a graph is a collection of points, called vertices, and lines between those points, called edges. There are many different types of graphs, such as connected and disconnected graphs, bipartite graphs, weighted graphs, directed and undirected graphs, and simple graphs.

Graphs are a common method to visually illustrate relationships in the data. The purpose of a graph is to present data that are too numerous or complicated to be described adequately in the text and in less space. Do not, however, use graphs for small amounts of data that could be conveyed succinctly in a sentence.

As a form of categorical data, binary data is nominal data, meaning they represent qualitatively different values that cannot be compared numerically.

Common data types include:

• Integer.
• Floating-point number.
• Character.
• String.
• Boolean.

A variable must have a data type associated with it, for example it can have data types like integer, decimal numbers, characters etc. The variable of type Integer stores integer values and a character type variable stores character value. The primary difference between various data types is their size in memory.

Every value that we declare in python has a data type. Data types are classes and variables are the instances of these classes.

Variable Types All variables in the Java language must have a data type. A variable’s type determines the values that the variable can have and the operations that can be performed on it. Primitive types contain a single value and include types such as integer, floating point, character, and boolean.