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Which classification do you think best represents the data and why?
Let's just say it was a process of elimination and list the reasons why I did not choose a classification:
- I thought the standard deviation data was best until I realized the data curve was not bell-shaped and data was skewed rather than normally distributed.
- Then I looked at the equal interval classification. While the data here was grouped into very familiar and easy to understand classes (25%, 50% etc...) the method, like quantile classification, does not consider the distribution of the data along the number line.
The Natural Break method is the best classification method to represent the percentage or proportion data for the following reasons: not only is it easy to understand and considers the distribution of data along the number line but it also places contiguous enumeration units into the same class, maximes spatial auto correlation and equalizes the area.



