2.12:

2.12: Diagramme à barres

JoVE Core
Statistics

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JoVE Core Statistics

Bar Graph

2.10: Scatter Plot

2.13: Multiple Bar Graph

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01:07 min

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April 30, 2023

Overview

A bar graph is also called a bar chart and consists of bars that are separated from each other. It either uses horizontal or vertical bars to show comparisons among categories. The bars can be rectangles, or they can be rectangular boxes (used in three-dimensional plots). One axis of the graph represents the specific categories being compared, and the other axis shows a discrete value. In this graph, the length of the bar for each category is proportional to the number or percent of individuals in each category. Some bar charts show bars clustered in groups of more than one (grouped bar graphs), and others depict the bars divided into subparts to show cumulative effect (stacked bar graphs). A bar graph is a better choice than a line graph or histogram because this data is categorical rather than continuous. Also, it is appropriate to compare the relative size of the categories. It is to be noted that the bar graphs that are organized from highest to lowest are called Pareto charts.

Transcript

Rappelons que les données qualitatives représentent des variables non numériques telles que différentes couleurs de cheveux, types de véhicules ou divers cours offerts par un collège.

Par exemple, considérez un tableau de fréquence avec le nombre d’étudiants inscrits à chacun de ces cours : statistiques, biologie, physique et chimie.

Ces données qualitatives peuvent être représentées visuellement à l’aide d’un graphique à barres.

Les catégories de données qualitatives, c’est-à-dire les différents cours proposés, sont représentées le long de l’axe horizontal, et les fréquences, ou le nombre d’étudiants, sont données le long de l’axe vertical.

Ensuite, dessinez des barres de largeur égale reliant les catégories et le nombre correspondant d’élèves. La hauteur de ces barres indique les fréquences de différentes catégories.

La première barre indique que cinq étudiants sont inscrits en statistique, la deuxième barre montre trois étudiants inscrits en biologie, et ainsi de suite. Ces barres peuvent être placées avec ou sans espace entre elles.

Key Terms and definitions

Bar graph - A visual representation showing comparisons among categories with bars.
Rectangular bar - The shape used in a bar graph to denote a category.
Grouped bar graph - A bar graph with bars clustered in groups representing extra dimension of data.
Stacked bar graph - Bar graph where bars are divided into subparts showing cumulative effect.
Pareto chart - A bar graph organized from highest to lowest importance.

Learning Objectives

Define Bar graph - A tool for visual comparison of categorical data (e.g., bar graph).
Contrast Grouped vs Stacked bar graph - Explain their differences, usage and advantages (e.g., scientific studies).
Explore Applications of bar graph - Describe various scenarios where bar graph could be vital (e.g., statistical comparison).
Explain vertical vs horizontal bar chart - Discuss orientation difference and their impact.
Apply Pareto chart in Context - Demonstrate utility of ordered bar graphs in prioritizing issues.

Questions that this video will help you answer

What are the applications of a bar graph and how to interpret one?
What visual difference does orientation bring to a bar graph?
How does a Pareto chart aid in problem-solving in a business context?

This video is also useful for

Students - Helps comprehend data visualization concepts and enhance analytical skills.
Educators - Provides a framework to teach data comparison and analysis techniques.
Researchers - Bar graph can visually communicate data trends in research papers for easier understanding.
Data Analysts - Act as a tool to present clear comparison among different categories for decision making.

Tags

Graphique à barres Graphique à barres Barres horizontales Barres verticales Comparaisons Catégories Valeur discrète Graphiques à barres groupées Graphiques à barres empilées Données catégorielles Diagrammes de Pareto Visualisation de données