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Posts: 25
Reply with quote  #1 

I have information about the distribution of age and sex of our clients in a table:

AgeSex% of total clients
a) [0,20]F0,40%
a) [0,20]M0,40%
b) (20,40]F14,60%
b) (20,40]M19,60%
c) (40,60]F19,10%
c) (40,60]M24,80%
d) (60,80]F8,10%
d) (60,80]M10,80%
e) (80,105]F1,00%
e) (80,105]M1,30%

What would be the best way to display this visually? Maybe something like the attached image?

Attached Images
Name: fördelning.png, Views: 20, Size: 9.32 KB


Posts: 852
Reply with quote  #2 

What you're trying to display is called a "frequency distribution." When you use bars to do this, as you have, the graph is called a "histogram." Histograms work fine with a single series of values, but you're displaying two series: one for females and one for males. Bars don't make it easy to compare the two distribution patterns. An alternative is to use lines instead of bars, in the form of a "frequency polygon." I've included an example below. Notice how much easier it is to see and compare the two distribution patterns when they're displayed as lines.

Also notice that I changed how the age groups are labeled. With your labels, you can't tell if a 20 year old would be counted in the first age group or the second. With my labels, this ambiguity is resolved.

The questions that you've asked here and elsewhere in this discussion forum are all addressed in my book Show Me the Numbers. You would save yourself a lot of time by reading it.

Attached Images
Name: Distribution by Sex and Age.png, Views: 20, Size: 27.86 KB

Stephen Few

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