The Psychology of Quality and More |
A Toolbook for Quality Improvement and Problem Solving (contents) |
Bar Chart: How to do itThe Quality Toolbook > Bar Chart > How to do it When to use it | How to understand it | Example | How to do it | Practical variations
How to do it
A typical measurement is of all events of a specific type within a defined time period. for example, 'Value of all cosmetics sales within one financial year'. There may be several data ranges, for example, 'Sales figures for this year and last year' (which are to be compared in the chart).
For example, a year's sales figures are better shown as 12 monthly bars,
rather than 52 weekly bars. However, if this year's sales are being compared
with those of the past 2 years (using groups of 3 bars), then it may be better
that each bar represents 3 months, which will again result in 12 bars on the
chart. Ensure that the data collection process gives reliable data, for example by using trained people.
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