A reader need go no further than page two of Leland Wilkinson’s The Grammar of Graphics before reading, “We will also come to realize why a histogram is not a bar chart and why many other graphics ...

A histogram is drawn like a bar chart, but often has bars of unequal width. It is the area of the bar that tells us the frequency in a histogram, not its height. Key fact Instead of plotting frequency ...

Sometimes a histogram will already be drawn for us. We can then use this to find the frequency of each group, and hence the total frequency for the distribution. This histogram is to show the number ...

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