Not everything can be solved with a line chart. Line charts are generally used to show a progression. This is not a progression. Its a comparison. Use bars. Just not stupid ones like in the original.

Totally agree. This is not a progression, so a bar or pie charts would work best and show the data correctly

Yet another objection to the line chart, at least as implemented here, is the introduction of a legend (key). Legends are at best necessary evils to be omitted where possible. The back and forth -- Mali is this colour, etc. -- is dispensable.

This dataset is also so simple in structure that a table would do fine.

I think the point here is that you might not need a chart at all - since you are showing the exact same data for all three countries...

Nick P. got the point. Yes, I agree the line chart is not the best here; that's why I said I wasn't offering it as an alternative.

Well, yes and no. If I read your line chart correctly, the disapprovers vary from about 7% to 11%. Whether that is about the same, considering, or an interesting deal is one on which experts in survey statistics and African politics might have something to say.

My instinct is to say with you that it's not a big deal. In addition to the usual problems of sampling error and non-response, I'd add a language question. It is difficult to believe that the surveys were all administered in the same language, and that the words used are exactly equivalent in meaning, although you'd expect Gallup to be aware of that issue.

But the numbers are not identical.

Let's start with what we are trying to tell the reader: that approval is high (89%) in all three countries. The don't know and refusal rates are so small that they really don't matter, so the disapproval rates can easily be imagined, once the approval rates are seen.

Three bars, one for each country, showing the approval rating, make the point: approval is 89% in each country.

Of course, this would be better written in a sentence than shown in a graph, as graphing this information violates an essential principle of charts: it shows less than one piece of information per square centimetre.

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