In this class we are going to learn read papers critically.

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Presentation transcript:

In this class we are going to learn read papers critically. Papers can be wrong, boring, hard to read etc. Papers can also have very poor figures ;-) Lets spend a few minutes to see a some examples of poor figures, and how we might go about fixing them. Why spend this time? If you make good figures, your paper has a higher chance of getting accepted, and being cited.

Lettering too small and font difficult to read Here the font size on the legend and key is about 1mm. (coin for scale)

Key outside the graph (indirection) Here the problem is not that the key is in text format (although it does not help). The problem is the distance between the key and the data. Data Key

Unnecessary numbers in the axis Do we really need every integer from zero to 25 in this chart? (if “yes”, then make a table, not a figure) In this version, I can still find, say “23”, by locating 20 and counting three check marks. This problem is more common in the X-axis

In the following slides is a figure one of my students made. I keep prodding her, until I was happy with the figure. Lets see how that worked…

4 6 8 10 12 14 16 18 20 500 1000 1500 2000 2500 Figure 17. The true positives (green/left) and true negatives (red/right) for the fish problem.

What does the bounding box do for us? 4 6 8 10 12 14 16 18 20 500 1000 1500 2000 2500 Figure 17. The true positives (green/left) and true negatives (red/right) for the fish problem. What does the bounding box do for us? Lets get rid of it.

4 6 8 10 12 14 16 18 20 500 1000 1500 2000 2500 Figure 17. The true positives (green/left) and true negatives (red/right) for the fish problem.

2500 2000 1500 1000 500 4 6 8 10 12 14 16 18 20 It is hard to read the heights (or existence) of very small bars because they are so close to the axis

Solution: “explode” away the X-axis. 2500 2000 1500 1000 500 2 4 6 8 10 12 14 16 18 20 Solution: “explode” away the X-axis.

Do we need the black outline around the bars? 2500 Do we need the black outline around the bars? 2000 1500 1000 500 2 4 6 8 10 12 14 16 18 20

2500 The figure looks better without them, especially if the histogram is resized small for a paper. 2000 1500 1000 500 2 4 6 8 10 12 14 16 18 20

Hmm.. Did we choose the right bucket size for the data? 2500 Hmm.. Did we choose the right bucket size for the data? 2000 1500 1000 500 There is no reason to think the default in Matlab or Excel is correct for your data…. 2 4 6 8 10 12 14 16 18 20 4500 Too coarse 900 About right 300 Too fine 4000 800 250 3500 700 3000 600 200 2500 500 150 2000 400 1500 300 100 1000 200 50 500 100 2 4 6 8 10 12 14 2 4 6 8 10 12 14 2 4 6 8 10 12 14

One distribution obscures the other. 600 400 200 2 4 6 8 10 12 14 16 18 20

We can use transparent colors 600 400 200 2 4 6 8 10 12 14 16 18 20

Does the Y-axis need to be there Does the Y-axis need to be there? Sometimes it is irrelevant and if so, remove it. 600 400 200 2 4 6 8 10 12 14 16 18 20

However, why not remove some indirection… Our figure caption tells us what we are looking at, that is good. It even uses color/location so that it will work in grayscale. However, why not remove some indirection… 2 4 6 8 10 12 14 16 18 20 Figure 17. The true positives (green/left) and true negatives (red/right) for the fish problem.

Do we even need the arrows? This is better. .. Do we even need the arrows? true positives false positives 2 4 6 8 10 12 14 16 18 20 Figure 17. The results for the fish problem.

Figure 17. The results for the fish problem. true positives false positives 2 4 6 8 10 12 14 16 18 20 Figure 17. The results for the fish problem.

true positives false positives 4 6 8 10 12 14 16 18 20 500 1000 1500 2000 2500 Figure 17. The true positives (green/left) and true negatives (red/right) for the fish problem. true positives false positives 2 4 6 8 10 12 14 16 18 20 Figure 17. The results for the fish problem.