![]() ![]() ![]() ![]() ![]() The graph is usually presented with an axis that indicates the values (not shown on figure 4.5.2.1).The whiskers are the two lines outside the box, that go from the minimum to the lower quartile (the start of the box) and then from the upper quartile (the end of the box) to the maximum.Sometimes, the mean is also indicated by a dot or a cross on the box plot. The vertical line that split the box in two is the median.The box covers the interquartile interval, where 50% of the data is found. The left and right sides of the box are the lower and upper quartiles.The figure shows the shape of a box and whisker plot and the position of the minimum, lower quartile, median, upper quartile and maximum. A box plot is ideal for comparing distributions because the centre, spread and overall range are immediately apparent.įigure 4.5.2.1 shows how to build the box and whisker plot from the five-number summary. It doesn’t show the distribution in as much detail as histogram does, but it’s especially useful for indicating whether a distribution is skewed and whether there are potential unusual observations (outliers) in the data set. The box and whisker plot, sometimes simply called the box plot, is a type of graph that help visualize the five-number summary. ![]()
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