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# Different Types of Graphs and Diagrams

## Biostatistics

## Community Dentistry

[Soben Peter 4th ed 373, 377/ 5th ed 600]

**Bar diagram**is used to represent qualitative data. It represents only one variable. Click Here

**Histogram**is a bar diagram without gap between the bars, It is a pictorial diagram of frequency distribution, It is used to depict quantitative data of continuous type. On the X-axis, the size of an observation is marked. On the Y-axis is the frequencies are marked. Click Here

**Frequency polygon**- This is used to represent frequency distribution of quantitative data and is useful to compare two or more frequency distributions. A point is marked over the mid point of the class interval, corresponding to frequency and these points are connected by straight lines. Click Here

**Pie diagram**is commonly used to show percentage breakdowns for qualitative data. It is so called because the entire graph looks Like a pie and its components represent slices cut from pie. A circle is divided into different sectors corresponding to the frequencies of the variables in the distribution.

The total angle at the center of the circle is equal to 360° segments are drawn in the circle according to the data and are shaded with different shades or colors. But, this diagram cannot be used to represent two or more data sets.Click Here

**Line diagram**is useful to study the changes of values in the variable over time and is the simplest type of diagram. On the X-axis, the time such as hours, days, weeks, months, or years are represented and the value of any quantity pertaining to this is represented along the Y-axis. Click Here

**Cartograms or spot map**is used to show the geographical distribution of frequencies of a characteristic. Click Here

**Pictogram**is simpler and popular method of presenting data to "man in street" and those who can't understand complicated charts. Here small charts are used to present the data.Click Here

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