AMS 5 Lecture Notes - Lecture 4: Statistic, Histogram, Central Tendency
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Example: histogram for us household incomes from 2015. Example: starting with the table of income distribution we saw earlier, we first draw the horizontal axis . Using a density scale, we draw rectangles over each class interval whose areas equal the percentages of the families in those intervals. Note: the height of each rectangle is equal to the percentage of the observations in the corresponding class interval divided by the length of the class interval (the width of the rectangle) Next we divide all of the frequency numbers by their range. The vertical scale here is percent per i. e. , it is the relative frequency (percentage) divided by the width of the intervals (which in this case are measured in s). It"s always a good idea to label the axes. Why density scale instead of percentages/frequency scale: the size of the bars then would just be misleading.