bar graph with quarterly average in...

Bar Graph With Quarterly

Average in Minitab®

A “How To” Worked Example

M. A. Sibley Consulting – All Rights Reserved Bar Line Graph in Minitab 1

Our Data

Here is part of our example data:


This data shows Natural Gas Consumption for my house and the

number of degrees days for the corresponding period.

We want to create some new variables based on this information.

Bar Graph with Average Line


First we round the dates to the start of the

month and also the start of the quarter.



Here is the result:

Note that 3 months are in each quarter. (Obviously!)



Next we want the average consumption for each Quarter:



This has put the average MetersCubed for the Quarter beside the

corresponding quarter on each line.

Mean 1 is a non descriptive name so we interactively change it to QtrAvg



Graph > Scatterplots:



The resulting graph is a start:



We right click on the graph and choose Add > Data Display:



We Left Click twice (slowly) on one of the project lines for QtrAvg to select the QtrAvg Project Lines and then we Right Click and select Edit Project Lines



We make further edits: • Edit the Symbols for the

MetersCubed Line and select Custom type None

• Right Click on the Project Line for MetersCubed and select Custom and type in Size 11

• Right Click on the Symbols for QtrAvg and select Custom Type of a Diamond and Size of 1.5

• Delete the Legend • Change the Y axis label to

Meters Cubed • Change the Y axis Minimum to

0 (so the project lines start at zero)

• Change the title

Then we select the Custom Project Line

Type of None.



We don’t have an Quarterly

Average line per se, but this graph

gets the point across.

Using the techniques shown elsewhere on this

web site you could capture the

macro code so that it is easy to

recreate this graph.



With a little macro programming we can get a nicer

result.

bar graph with quarterly average in...

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