Why Measure
"Like most poets, preacher, and metaphysicians, he burst into conclusions at a spark of evidence." —Henry Seidel Canby of Ralph Waldo Emerson (from Quoteland.com).
Why is the standard U.S. railroad width 4 feet, 8.5 inches?
|   |
Dimensions of Measurement
Examiners of the Malcolm Baldrige National Quality award evaluate an organization based on how to do it (implementation):
Here are the dimensions of measurement:
We make decisions based on assumptions and myths about the relationsip among these dimensions. For example, we assume that higher volume results in higher profitability. |   | Get this print framed for your wall!
|
Great DashboardsAn example: the Akamai Net Usage Index for Retail applies several principles for effective dashboards: 1. Use a visual map A familiar map of the world, U.S. states, street map, floor plan, etc. provides memorable anchors to make items easier to find. 2. Present data versus what is "normal" or average The "7% Above Normal" in the lower right corner and "+21%" for "South America" flags exceptions which help values rise out of the clutter. Normal values do not need to be shown because that can be calculated from the number and the percentage. 3. Provide a Legend of Abbreviations. Example: "VM = Visitors per Minute". 4. Normalize values using a base population statistic. Dividing a raw activity number such as VM by the population generating that activity generates a utilization statistic that marketers may consider useful because it focuses on the pool of potential customers. For example, activity in Asia (North Korea in particular) will seem small when expressed as a percentage of its population. "Per square mile" of land mass is another base statistic. 5. Highlight peak values and correlate them to events. The Akamai Net Usage Index for News lists previous peaks and associated news event. 6. Allow users to specify the meaning of colors. Different cultures assign different meanings to a particular color. Those who are color-blind may need different tones of black and white. 7. State conclusions based on facts. Some say numbers are useful only if they lead to some conclusion that supports a recommendation for action. 8. Correlate Different Measurements. |
Formats of Presentation
Different formats of charting are used to graphically present the status of measurements. Each format has a unique purpose. One chart format alone does not tell the entire story.
Box and Whisker Charts (about data distribution) Cumulative Line Charts Trend Line Charts Percentage Trend Charts Seasonality Charts Indexed Trend Charts Geographic Maps These major formats are described below. BeGraphic.com adds on to Excel and Powerpoint creates these innovative charts: REMEMBER: time advances from left to right. |   |
|
Bar Charts
This bar chart below shows the market share of internet browser versions. |   | Get this print framed for your wall! |
Box and Whisker Plots
|
Cumulative Line Charts
show the accumulation of hours, dollars, or other variable over a period of time. The value from a particular period is added to the total from the preceding period. |
Trend Line ChartsTrend lines usually illustrate a countable measure of volume to show absolute increases or decreases over time. Trend lines are commonly used to show financial indexes such as the Dow Industrials and the S&P Composite. The example here is the Netcraft survey of the software used to run each internet domain. Each trend line on the chart shows the result for a different subgroup. The problem with this chart is that subtle variations may not be apparent when there are large gaps or when all lines move the same way. |
Another example of this format is to show the pattern in pass/fail percentages over time as builds are created.
Charts such as these are used to Gauge Software Readiness With Defect TrackingIf a chart shows the percentage of how many hours are spent in overtime, etc., this format would help us visualize patterns in Chargeability Percentage or Overtime Percentage over time. and helps us see when we have over extended ourselves in overtime.
Geo MapsGoogle Maps and Google Earth. Yahoo Maps. GPS
d-maps.com provides maps to download in WMF file format to a folder such as
|
Multi-dimensional graphs
Brooks calls it "Naughty Physics" His compact LUFE Matrix uses a X-Y Cartesian coordinate system to represent the fabric of time and space (the fundamental symmetry of Nature). However:
Brooks' proofs incorporates all measurements
The LUFE matrix does not consider dimensionless units, which include Dimensional Analysis
|
Data Visualization: Network Diagrams
Network charts can be created using the NodeXL Excel add-in on Codeplex by University researchers using WPF. Graph data formats include GraphML, Pajek, UCINet, and matrix. Data Mining tools in Excel include: |
Resources
| $59 Software Metrics: Establishing a Company-wide Program by Robert Grady and Deborah Caswell. Prentice Hall 1989. included with technical details is a chapter on selling metrics to management, with slides and points to emphasize. Use the word "fewer" when you're talking about things that can be counted, such as individual hairs and snowflakes. Use the word "less" when you're talking about uncounted general quantities such as hair and snow. |
| Your first name: Your family name: Your location (city, country): Your Email address: |
Top of Page
Thank you! |