## Pie Charts

Pie charts are used to show classes or groups of data in
proportion to the whole data set. The entire pie represents all
the data, while each slice represents a different class or group
within the whole.

#### Things to look
for:

- Look for the largest piece to find the most common
class.
- Notice relative sizes of pieces. Some classes might be
unexpectedly similar or different in size.
- Try looking at a two-dimensional view of the pie; 3D charts
are attractive but they can make pieces at the front of the
picture look bigger than they really are.

#### Pie chart
statistics:

For the pie chart, the following statistics are
calculated:

**Mean** |
the average of all the data points
in the series. |

**Maximum** |
the maximum value (biggest slice) in
the series. |

**Minimum** |
the minimum value (smallest slice)
in the series. |

**Sample Size** |
the number of values (slices) in the
series. |

**Range** |
the maximum value minus the minimum
value. |

**Standard Deviation** |
Indicates how widely data is spread
around the mean. |

Create Pie Charts using PathMaker's Data Analyst tool.