7.2 TYPESOF DIAGRAMS
Pie Chart.A pie chart displays value data as percentages of the whole.Categories are represented by individual slices.The size of the slice is determined by the value.Pie charts are typically used to show percentages.
Sample 7（5）
As shown in the above sample，employees'educational background of a firm is clearly stated with different slices representing respective percentages.
Bar Chart.A bar chart displays series as sets of horizontal bars that are grouped by category.Values are represented by the length of the bars as measured by the x-axis.Category labels are displayed on the y-axis.Bar charts are typically used to compare values between categories.
Sample 7（6）
From the above bar chart，we identify the retail sales of consumer goods in different areas，and thus can easily see the difference and make comparison.
Line Chart.A line chart displays series as a set of points connected by a line.Values are represented by the height of the point as measured by the y-axis.Category labels are displayed on the x-axis.Line charts are typically used to compare values over time.
Sample 7（7）
A—the chain stores located in the downtown area
B—the chain stores situated in a densely populated district
C—the chain stores located in the suburbs of the city
In the line chart above，the three curve lines represent respectively a company's profits from 1998 to 2002 in three areas.
Flow Chart.A flow chart，also called flow diagram or flow sheet，is a schematic representation of a sequence of operations，as in a manufacturing process or computer program.(https://www.daowen.com)
Sample 7（8）
PerFormance Evaluation Chart
Organization Chart.An organization chart is one that tells the internal structure and composition of a company，an organization...
Sample 7（9）
To design a chart for a certain purpose，follow the tips given below：
●Identify your purpose；
●Select the chart（line chart，pie chart...）that serves your purpose best；
●Decide the data for charts，which usually is organized into three areas：values，category groups，and series groups.The following sample helps you with the understanding of the three items.
Values.When you define a chart，you add at least one value series to the chart.Values determine the size of the chart element for each category group.For example，values determine the height of a column/bar in a bar chart and the size of a slice in a pie chart.
Categories.Use categories to group data.Categories provide the labels for chart elements.For example，in a bar chart，category labels are placed on the x-axis of the chart，one for each set of columns.
Series Groups.Series groups are optional.You can define a series group to add an additional dimension of data to a report.For example，in a column chart that displays sales by product，you can add a series group to display sales by year for each product.Series group labels are placed in the legend of the chart.
Sample 7（10）
Series groups are dynamic.A chart that uses series groups displays a chart element for each series group for each category.