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Posts: 21
Reply with quote  #1 
it just me or this chart is not effective to display the year over year change of sales? YOY.png 

Posts: 802
Reply with quote  #2 

This is one of the ways that year-over-year change can be displayed. Every bubble above and to the left of the diagonal represent positive changes, and those below and to the right of the diagonal represent negative change. Although I would usually display this information as a line graph with only two data points per line (i.e., what is sometimes called a slope graph), because that would be easier for most people to understand, a scatter plot designed in this manner might work as well or better for some people.

Stephen Few

Posts: 181
Reply with quote  #3 
I also find the designed graph good enough, using X and Y to encode years sales and the size of the bubble for the cost. A slope graph, probably more intuitive, is useful for comparing the variation of sales, but it cannot encode the third quantitative measure, the cost. 

If user interactivity is possible and not many items are in the list, one choice would be a table like design where we associate bars to values, user being able to sort the table, hide columns, change columns order. (colors are not a must, I just highlighted here the sorted measure). However quantitative correlations are not that obvious.


Another design which works for me is the following connected scatter chart. Y position encodes the cost, X position encodes sales in 2015 and 2016, length of the segment encodes the sales variation and color encodes the sign of variation. I choose to use a darker circle for year 2016 sales, to provide more visibility to current year sales correlation with the cost. While variations are well encoded by the length of the segments, the comparison between them is not ideal. For me this design is a better alternative to original bubble chart, but is possible that other participants will have a different opinion. 


Posts: 181
Reply with quote  #4 
I need to mention that above design has nothing in common with the connected scatterplot exhaustively criticized in a different thread. I posted several comments in that thread none of them in the favor of a connected scatterplot.

The criticized connected scatterplot connects the markers of the same series in a time order, while above design connects the correspondent items from two different series.

Posts: 17
Reply with quote  #5 
Just as a reference, below is a quick example of a slope graph.

slope example.PNG 

"In the realm of data visualization, we face many challenges that are worth pursuing. Creating an effective radial gauge is not one of them. It is a fool’s errand. Do I strike you as a fool?" - Stephen Few
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