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Bar graph
A bar graph displays discrete data in separate columns. A double bar graph can be used to compare two data sets. Categories are considered unordered and can be rearranged alphabetically, by size, etc.

Advantages Visually strong can easily compare two or three data sets

Disadvantages Graph categories can be reordered to emphasize certain effects

Use only with discrete data

Pie chart
A pie chart displays data as a percentage of the whole. Each pie section should have a label and percentage. A total data number should be included.

Advantages Visually appealing shows percent of total for each category

Disadvantages No exact numerical data

Hard to compare 2 data sets

“Other” category can be a problem

Total unknown unless specified

Best for 3 to 7 categories

Use only with discrete data

Line graph
A line graph plots continuous data as points and then joins them with a line. Multiple data sets can be graphed together, but a key must be used.

Advantages Can compare multiple continuous data sets easily interim data can be inferred from graph line

Disadvantages Use only with continuous data

انواع نمودار و جداول آماری