Histograms- 'Frequency density' or 'Frequency' on vertical axis?

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Al4stair
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#1
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#1
There are many contradicting statements on this issue. For example, http://www.bbc.co.uk/schools/gcsebit...a3hirev3.shtml states that the vertical axis should have the frequency density on it, similar to my textbook.
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Yet many show frequency on the the vertical axis, just search 'histogram' in Google images... https://www.google.co.uk/search?q=hi...w=1536&bih=759

So is there is a definitive answer to whether frequency or frequency density should be on the y axis on a histogram graph?
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Al4stair
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#2
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https://scontent-mxp1-1.xx.fbcdn.net...e5&oe=5B276772

This may be the answer^. That is according to Wikipedia, https://en.wikipedia.org/wiki/Histogram.
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Y1_UniMaths
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#3
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#3
Frequency density usually goes on the y axis
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The Introvert
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As far as I’m aware it’s only a histogram if you plot frequency density.
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PopcornPineapple
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#5
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It depends on the size of the class widths- if they are different sizes (like the bitesize one) then you need to calculate frequency density, but if they are all the same size then you can just leave it as frequency
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chazwomaq
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#6
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(Original post by PopcornPineapple)
It depends on the size of the class widths- if they are different sizes (like the bitesize one) then you need to calculate frequency density, but if they are all the same size then you can just leave it as frequency
^^This is the right answer (the "class widths" are usually called "bins").

For what it's worth, I've only every seen or used absolute frequency histograms in my working life.
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PopcornPineapple
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#7
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(Original post by chazwomaq)
^^(the "class widths" are usually called "bins").
Ah, thanks for clearing that up
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the bear
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#8
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if the boxes are of unequal widths then you will use frequency densisty on the vertical axis.

it is possible to use fd vertically if the boxes are of equal widths but that would just be perverse.
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Al4stair
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#9
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#9
(Original post by PopcornPineapple)
It depends on the size of the class widths- if they are different sizes (like the bitesize one) then you need to calculate frequency density, but if they are all the same size then you can just leave it as frequency
Okay. Thanks.
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