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...
scale_x_reverse()gives me an error...