About the chart... I cannot really visualize the proportions per category, specially for the least represented category. Could you find a better representation?
Yeah, I see your point! Don't worry, right now all my visualizations are for acknowledge purpose only. I'm exploring the data and sharing some interesting facts with text & simple vizs.
But I need to add a legend for grey NA, that's totally true, but not sure how to do it in an easy way with ggplot. You said you love gplot, can you help me? :) Do you know how to add custom legend for stat_count or just add NA into legend?
Of course, I've tried to search for it, but didn't find any simple solution... R is so not user friendly!
I am interested, although I might not be on pace for any other training at the moment... can you tell me why you are into multilinear algebra and where, how, etc is the training you want to follow?
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Advice for the last one? Easy: show the proportions and look for a way to report the n per category somewhere else? Perhaps in the sub-title of the figures...
Proportions instead of total counts for this one will allow cross-comparisons (a simple way to standardise the data...)
Not totally sure what do you mean...