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Anand Iyer
Nov 10, 2020, 4:32:41 AM11/10/20
to Discussion forum for Statistics for Data Science I
As per Week2FAQ.pdf
Expanding or compressing the scale on a graph, that can make changes in the data
seem less significant than they actually are, is known as the manipulation of y-axis.
Now, in the given chart votes share of both parties in the US are plotted as a bar chart. I assume that the Y-axis should be 100%. But, it's maximum value is 65%. Isn't it a manipulated Y-axis then (as per the above definition)?
statistics-1
Nov 10, 2020, 6:14:42 AM11/10/20
to Discussion forum for Statistics for Data Science I, anandd...@gmail.com
Hi,
It is representing the share of votes out of 100%. Compressing does not simply mean to reduce the maximum point on y axis, here compressing means change of scale on y axis with respect to maximum y values due to which proper information is lost.
Thanks
Ankur Upadhyay
Course Support Team
Anand Iyer
Nov 10, 2020, 6:19:36 AM11/10/20
to statistics-1, Discussion forum for Statistics for Data Science I
Hi Ankur,
FAQ clearly states differently.
There are two graphs in the Q.2 in FAQ where you're trying to depict the same information, in two ways. One with a smaller scale and another with a larger scale. While the first one is okay, the second is mentioned as a manipulated Y-axis. It's clearly stated there, no change in information has to happen to be called manipulated.
Cheers,
Malabika Guha Mustafi
Nov 10, 2020, 10:54:57 PM11/10/20
to Discussion forum for Statistics for Data Science I, Anand Iyer, Discussion forum for Statistics for Data Science I, statistics-1
@Anand,
But during graded assignment, you and team clarified me that if we scale up unnecessary y axis ( like 200 to represent 100 marks ) then it should be considered as manipulated Y axis.
Anand Iyer
Nov 10, 2020, 11:03:06 PM11/10/20
to Malabika Guha Mustafi, Discussion forum for Statistics for Data Science I, statistics-1
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Malabika Guha Mustafi
Nov 11, 2020, 12:25:38 AM11/11/20
to Discussion forum for Statistics for Data Science I, Anand Iyer, Discussion forum for Statistics for Data Science I, statistics-1, Malabika Guha Mustafi
@ Anand ,
Today I have found the three examples are described as manipulated or truncated Y axis. So , it is with your understanding only.
Anand Iyer
Nov 11, 2020, 12:26:02 AM11/11/20
to Malabika Guha Mustafi, Discussion forum for Statistics for Data Science I, statistics-1
:)
I'm okay with that, as far there's no score associated with the answer!
On Wed, Nov 11, 2020 at 10:54 AM Malabika Guha Mustafi <malabi...@gmail.com> wrote:
@ Anand ,Today I have found the three examples are described as manipulated or truncated Y axis. So , it it with your assumption only.
Cheers,
Malabika Guha Mustafi
Nov 11, 2020, 12:28:37 AM11/11/20
to Discussion forum for Statistics for Data Science I, Anand Iyer, Discussion forum for Statistics for Data Science I, statistics-1, Malabika Guha Mustafi
:)
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